Sauté onion in oil over medium heat for 2 minutes. Add turkey and mushrooms and cook 3 minutes. Add 1 cup salsa and heat thoroughly. Add 3/4 cup grated cheddar cheese and heat until it melts.
Remove from heat. Warm tortillas for 30 seconds on each side in an ungreased frying pan.
Spread a layer of turkey mixture. Add sour cream and salsa. Roll, cut in half and serve.
Servings: 4