Ingredient:

• 1 tablespoon olive oil
• ½ red onion, chopped
• salt
• 8 to 10 ounces cremini mushrooms (AKA baby bellas), thinly sliced
• 6 ounces baby spinach, roughly chopped
• ½ small lime, juiced
• 2 ½ cups shredded raw Jack or cheddar cheese, divided
• 2 avocados from Mexico, cut into thin slices
• 4 medium whole wheat tortillas
• jarred red salsa