Heat oven to 350 degrees. ... large skillet, brown beef and onion. Drain. Add gravy ... 1 1/2 quart casserole. Top with mashed potatoes ... or until thoroughly heated.
Saute onions, garlic, and mushrooms in butter. Add beef until brown. Stir in lemon ... Place in greased casserole. Sprinkle with parsley. Bake at 350 degrees for 30 minutes.