Baked Spinach Mushroom Quesadillas

Baked Spinach Mushroom Quesadillas
Ingredients:
4 tortillas (8 inch)
Olive oil (optional, enough to lightly coat the tortillas)
1 cup shredded mozzarella
1 cup shredded cheddar
3 cups roughly chopped spinach
8 ounces sliced mushrooms