In a skillet large enough to hold steaks in one layer heat 1tablespoon butter. Season steaks with salt and pepper, sear in skillet turning once until done to your degree of doneness about 2 to 3 minutes a side for medium rare. Remove to a plate. Into same pan add peppers, onion, garlic and mushrooms cook until softened. Make four even piles of vegetables in skillet top each with a slice of cheese cover, lower heat and melt cheese.