Preheat your air fryer to 390°F (195° Celsius).
Wash peppers and pat them dry.
Cut each pepper in half and remove the seeds. Then cut it into 1-inch strips or squares.
Slice onion in half, then thinly slice into half-circles.
Rinse mushrooms and pat them dry. Cut each mushroom in half, or into quarters for larger mushrooms.
In a large bowl add sliced peppers, mushrooms, onions, oil, salt & pepper to taste and season.
Toss them all together until fully coated.
Transfer veggies to the air fryer basket/tray, and lay them in a single layer.
Air fry them for 10 to 15 minutes (toss them every five minutes so that they cook evenly from each side). I did mine for 13 minutes total and the veggies came out charred with gorgeous crispy skin.
Fry them until their desired color and crispiness.
When done, the onions should be translucent. Peppers should be golden brown with slightly charred skins. Mushrooms should be dark brown in color, slightly wrinkly on the outside, and juicy on the inside.
juicy and charred roasted veggies
Make it a Meal
Air fryer roasted peppers and mushrooms are an easy and versatile ingredient that can be used in almost any dish. I love adding them to salads, sandwiches, tacos or pies. Are you looking for something lighter than the usual soup or stew for a main course? May I suggest trying roasted peppers and mushrooms with:
Air fryer Ribye for a delicious low-carb meal
Air-fried Hot Dogs with Crispy Buns
Mushroom and Onion Grilled Cheese
Leftovers
Store roasted capsicum peppers and mushrooms in an airtight container in the fridge for up to 5 days.
Freeze cooked peppers & mushrooms in a ziplock bag for up to three months. Reheat in an air fryer for 2-3 minutes to bring back the outer crisp.
Recipe Tips and Variations
Use fresh, firm bell peppers and mushrooms that are in season. Avoid over-ripe vegetables, as they may become mushy and won’t hold their shape when air-fried.
Ensure that peppers and mushrooms are cut into evenly-sized pieces (1-inch slices) so that they cook evenly.
Don’t overcrowd the basket. Allow the vegetables to have space to cook evenly.
To change things up, sprinkle some Parmesan cheese over mushrooms and peppers for an extra savory kick.
Make them spicy: Add smoked paprika, a little chili powder or cayenne pepper.
Do Vegetables Shrink in the Air Fryer?
Yes! Like shrunken clothing after an accidental tumble in the washing machine! All three – mushrooms, peppers, and onions – belong to a genus of vegetables known as Allium which have high levels of moisture that can be lost when cooked. So whether you’re air frying these veggies, sauté, boil or fry them; they may look aesthetically pleasing but don’t forget that no matter what cooking method you choose they will eventually turn into a fraction of their original size.
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