2 tablespoons olive oil, divided, or more as needed
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0.25 cup chopped red onion
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3 cloves garlic, chopped
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1 tablespoon Italian seasoning
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0.25 cup crushed saltine crackers
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2 tablespoons grated Asiago cheese
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1 tablespoon ricotta cheese
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salt and ground black pepper to taste
Instructions
Preheat the oven to 400 degrees F (200 degrees C). Grease a baking sheet.
Remove stems from mushrooms. Chop stems and set aside. Brush caps with 1 tablespoon olive oil and place on the prepared baking sheet with the open sides up.
Heat remaining 1 tablespoon oil in a skillet over medium heat. Add onion, garlic, and Italian seasoning; cook for 2 minutes. Add mushroom stems and cook until tender, about 5 minutes. Remove from the heat and transfer to a bowl.
Add crushed saltines, Asiago cheese, and ricotta cheese to the onion-mushroom mixture and mix to combine. Season with salt and pepper. Fill each mushroom cap with a spoonful of the mixture.
Bake in the preheated oven until mushrooms are tender and filling is bubbling slightly, 20 to 25 minutes.