As I stood by the oven, the tantalizing aroma of Roasted Peppers and Onions wafting through the kitchen reminded me why I fell in love with cooking in the first place. This vibrant vegan side dish is not only a feast for the eyes but brings a delightful balance of smoky and sweet flavors to any meal. With just 5 minutes of prep time and around 30 minutes in the oven, it’s the perfect companion for busy nights when I want to put something wholesome on the table without the hassle. Plus, it’s naturally gluten-free and a fantastic way to sneak in veggies if you’re meal prepping for the week. Curious about how to elevate your dining experience with this colorful blend? Let’s dive into this deliciously satisfying recipe!

Why Try Roasted Peppers and Onions?
Vibrant Colors: This dish isn’t just tasty; it’s a feast for the eyes! The combination of red, orange, and yellow bell peppers creates a colorful side that brightens up any plate.
Easy Meal Prep: With only 5 minutes of prep work, you can pop this into the oven and pursue other tasks while it roasts to perfection. It’s a true time-saver!
Flavor Complexity: The smoky notes from paprika paired with the sweetness of caramelized onions deliver a flavor explosion that’s hard to resist.
Versatile Pairing: Serve these roasted beauties alongside eggs, in tacos, or atop grain bowls for an instant flavor upgrade. And if you’re looking to switch things up, check out these Garlic Parmesan Roasted sprouts!
Healthy and Delicious: Low in calories but high in flavor, this dish supports any health-conscious meal plan without sacrificing taste.
Roasted Peppers and Onions Ingredients
For the Vegetables
- Red Bell Pepper – Provides sweetness and vibrant color that brightens up your plate.
- Orange Bell Pepper – Adds a unique sweetness and contrasts visually for a stunning presentation.
- Yellow Bell Pepper – Further enhances sweetness and flavor depth, making every bite delightful.
- Small Onion – Complements the peppers with savory, sweet notes that enhance the dish’s complexity.
For the Roasting
- Avocado Oil – Used for roasting, it helps to caramelize the vegetables and prevents sticking; olive oil is a great alternative if preferred.
- Smoked Paprika – Contributes a rich smokiness, enhancing the overall flavor profile of the roasted peppers and onions.
- Oregano – Adds a hint of herbal freshness, or substitute with Italian seasoning for a different flavor twist.
- Salt & Pepper – Essential for enhancing the natural flavors; adjust to taste based on your preference.
Step‑by‑Step Instructions for Roasted Peppers and Onions
Step 1: Preheat the Oven
Begin by preheating your oven to 400°F (200°C). This temperature is perfect for roasting, helping develop that lovely caramelization on your vegetables. While the oven heats up, gather your baking sheet and prepping utensils so you’re ready to go as soon as your peppers and onions are sliced.
Step 2: Prepare the Vegetables
Carefully wash and slice the red, orange, and yellow bell peppers along with the small onion into uniform pieces, about 1-inch thick. These even cuts ensure that the Roasted Peppers and Onions cook uniformly, providing a mix of both tender and slightly crispy textures when done.
Step 3: Toss with Oil and Seasonings
Place the sliced peppers and onion on your baking sheet, ensuring they have space to breathe. Drizzle with avocado oil and sprinkle generously with smoked paprika, oregano, salt, and pepper. Toss the vegetables thoroughly, ensuring every piece is coated in that fragrant oil and seasoning blend for enhanced flavor.
Step 4: Arrange for Roasting
Spread the tossed vegetables in a single layer on the baking sheet. This crucial step prevents steaming and encourages proper roasting. Visually check to make sure none of the pieces are overlapping, as this will allow the heat to circulate properly around the Roasted Peppers and Onions for even cooking.
Step 5: Bake to Perfection
Put the baking sheet in the oven and roast the vegetables for 20 minutes. After this time, take them out and give everything a gentle stir to promote even browning. Return the baking sheet to the oven for an additional 10 minutes, watching closely until the vegetables are tender, beautifully caramelized, and give off an irresistible aroma.
Step 6: Serve and Enjoy
Once the Roasted Peppers and Onions are done, remove them from the oven and let them cool for a moment. Their vibrant colors and aroma will be delightful! Serve them warm as a standout side dish that complements a variety of meals, or use them to elevate your favorite tacos and grain bowls for added richness.

What to Serve with Easy Vegan Roasted Peppers and Onions
Pair your beautifully roasted veggies with these delicious complementing dishes to create an unforgettable meal experience.
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Creamy Mashed Potatoes: The velvety texture and buttery flavor balance the sweet and smoky notes of the peppers and onions perfectly.
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Hummus and Pita Chips: Serve as a refreshing appetizer; the creamy hummus pairs well with the charred veggies, adding a dip-worthy crunch.
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Quinoa Salad: A light, refreshing quinoa salad filled with herbs and citrus complements the rich flavors of the roasted mix, providing a nice contrast.
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Grilled Tofu: The firm texture and slightly smoky flavor of grilled tofu make it an ideal protein addition, harmonizing beautifully with the veggies.
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Savory Frittata: Pair the roasted peppers and onions with a light frittata for a wholesome breakfast or brunch; the eggs enhance the dish’s heartiness.
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Garlic Bread: The crispy, buttery garlic bread acts as a delightful side, allowing you to soak up the fragrant juices of the roasted peppers and onions.
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Red Wine: A glass of fruity red wine elevates the meal, contrasting the natural sweetness of the dish while enhancing its flavors.
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Lemon Sorbet: For dessert, a refreshing lemon sorbet brightens the palate after the savory sensations, satisfying your sweet tooth without heavy richness.
Expert Tips for Roasted Peppers and Onions
- Uniform Cuts: Ensure that your peppers and onions are cut into similar sizes to promote even roasting. This helps avoid undercooked or overcooked pieces in your roasted peppers and onions.
- Avoid Foil: Do not cover the baking sheet with foil; this traps steam and prevents proper caramelization. You want those lovely golden edges!
- Broiling Option: For a charred flavor, turn on the broiler for the last few minutes. Just keep an eye on them to prevent burning!
- Extra Veggies: Feel free to mix in other vegetables like zucchini or mushrooms. This variation can add new textures and flavors to your roasted peppers and onions.
- Tossing Technique: Toss the vegetables halfway through roasting for even browning. It’s a simple trick that makes a noticeable difference in the final dish!
- Seasoning Adjustments: Always taste before serving, and adjust salt and pepper as needed to enhance the flavors of your roasted peppers and onions.
Make Ahead Options
These Roasted Peppers and Onions are perfect for meal prep enthusiasts! You can slice and season the vegetables up to 24 hours in advance, simply refrigerate them in an airtight container to maintain their freshness. When you’re ready to enjoy them, just spread them out on a baking sheet and roast directly from the fridge, allowing an extra couple of minutes in the oven for even cooking. To preserve their vibrant colors and flavors, avoid overlapping the pieces while roasting. This way, you’ll have a delicious, time-saving side dish ready to complement your meals throughout the week!
How to Store and Freeze Roasted Peppers and Onions
Fridge: Store in an airtight container for up to 3-4 days. Allow the roasted peppers and onions to cool slightly before sealing to retain freshness.
Freezer: For longer storage, freeze the roasted peppers and onions in a single layer on a baking sheet. Once frozen, transfer to a freezer bag for up to 3 months.
Reheating: To reheat, microwave for 1-2 minutes or sauté in a pan over medium heat until warmed through. This will bring back their vibrant flavors.
Serving Idea: Use your stored roasted peppers and onions to quickly elevate your meals, adding them to wraps, salads, or omelets for an effortless flavor boost!
Variations & Substitutions for Roasted Peppers and Onions
Feel free to mix things up and make this delightful dish your own with these creative twists!
- Herb-Infused: Swap oregano for fresh thyme or basil for a refreshing herbal flavor. These herbs enhance the dish while adding a fragrant aroma.
- Spicy Kick: Add a pinch of red pepper flakes or diced jalapeños to the mix if you like a bit of heat in your roasted peppers and onions.
- Balsamic Glaze: Drizzle with balsamic glaze before serving for a tangy-sweet finish that complements the smokiness beautifully. It’ll make your taste buds dance!
- Mushroom Medley: Mix in sliced mushrooms for an earthy twist. Their meaty texture pairs wonderfully with the sweetness of the roasted peppers and onions.
- Mediterranean Flair: Toss in some kalamata olives and crumbled feta cheese after roasting for a delicious Mediterranean-inspired dish. It’ll add a lovely saltiness that’s simply irresistible.
- Cumin Comfort: Substitute smoked paprika with ground cumin and coriander for a warm and cozy flavor profile. This combination brings a whole new dimension to your roasted vegetables.
- Grain Bowl Boost: Layer the roasted peppers and onions on top of quinoa or brown rice for a wholesome meal. Add some avocado and a splash of lime juice for a fresh finish.
- Zesty Citrus: Add lemon or lime juice just before serving to brighten the flavors and add a zesty kick. It’s a simple yet effective way to uplift the dish!
Embrace your culinary creativity and enjoy making this dish your own! If you’re looking for more pairing ideas, consider trying it with Roasted Sweet Potato for a delightful mix of flavors or adding them to a breakfast burrito with elements from Tennessee Onions for an even heartier option.

Roasted Peppers and Onions Recipe FAQs
What is the best way to select ripe bell peppers for roasting?
Absolutely! When selecting bell peppers, look for those that are firm, shiny, and free of blemishes. The skin should be tight, and you might prefer those with a vibrant color, indicating ripeness. Avoid peppers with dark spots or wrinkles, as this suggests they are past their prime.
How should I store leftover roasted peppers and onions?
To keep your roasted peppers and onions fresh, store them in an airtight container in the refrigerator for up to 3-4 days. Make sure they are cooled down before sealing to prevent moisture buildup. This way, they’ll retain their flavor and texture for your next meal!
Can I freeze roasted peppers and onions?
Yes, you can! To freeze roasted peppers and onions, first, allow them to cool completely. Then, spread them out in a single layer on a baking sheet and freeze until solid (about 1-2 hours). Once frozen, transfer them into a freezer bag and remove as much air as possible. They’ll stay good for up to 3 months. When ready to use, simply toss them directly into your dishes or thaw overnight in the fridge.
What should I do if my roasted peppers and onions come out mushy?
If your roasted peppers and onions end up mushy, it may be due to overcrowding on the baking sheet or oven temperature being too low. Always make sure to spread them in a single layer to allow proper roasting and caramelization. If you find they are mushy, try increasing the temperature to 425°F (220°C) and roasting them for a shorter time, checking frequently to avoid burning.
Are roasted peppers and onions safe for my dog to eat?
While roasted peppers and onions are safe for human consumption, onions should be avoided for dogs as they can be toxic. It’s advisable to offer them plain bell peppers instead as a treat, ensuring they are cut into small, manageable pieces. Always consult with your vet before introducing new foods to your pet.
Can I use different seasonings for my roasted peppers and onions?
Very! Feel free to experiment with seasonings. You can swap smoked paprika for cumin or add a pinch of chili powder for a kick. For an Italian twist, consider using Italian seasoning or even adding fresh herbs like rosemary or thyme. This flexibility makes the dish a delightful staple in your kitchen!

Savor Roasted Peppers and Onions: A Colorful Vegan Delight
Ingredients
Equipment
Method
- Preheat your oven to 400°F (200°C). Gather your baking sheet and prepping utensils.
- Wash and slice the red, orange, and yellow bell peppers along with the small onion into uniform pieces.
- Place the sliced peppers and onion on your baking sheet. Drizzle with avocado oil and sprinkle with smoked paprika, oregano, salt, and pepper. Toss thoroughly.
- Spread the tossed vegetables in a single layer on the baking sheet to prevent steaming.
- Roast the vegetables for 20 minutes, then stir and roast for an additional 10 minutes until tender and caramelized.
- Remove from the oven and let cool slightly. Serve warm as a side dish or in tacos and grain bowls.

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