Quesadillas Jamur Gouda Asap

Bahan-bahan (5 porsi)

• 1 yellow onion
• 2 bell peppers (I used red and yellow)
• 1 tablespoon olive oil
• 4 tablespoons butter, divided
• 16 ounces fresh sliced white mushrooms
• 1 1/4 cup shredded cheese (obvi, smoked gouda is my fave)
• 10 flour tortillas
• sour cream and cilantro and anything else for topping