1You will need a 10 or 12" castiron skillet..Preheat oven to 350...Put half of the slides of tomatoes and 1/2 of sliced mushrooms in the bottom of the skillet. Mix cheese,bread crumbs,salt and pepper together in a mixing bowl.
Sprinkle half the mixture over tomatoes and mushrooms.Dot with slices of butter.
2Now make a 2nd layer just like the first. dot with more butter.. Bake for 55 min.