2 (10 ounce) cans refrigerated muffin mix
1 (8 ounce) container sour cream
1 (8 ounce) can tomato sauce
1 (2 ounce) can sliced mushrooms, stemmed
2 cups shredded Cheddar cheese
Preheat oven to 350 degrees F (175 degrees C). Spray muffin cups or line with paper muffin liners with no shells, or bake in preheated oven for 8 to 10 minutes. Fill muffin cup with sour cream, tomato sauce and sliced mushrooms.
Bake in preheated oven for 10 minutes, until bubbles form on top of muffin.