In a skillet over low heat, melt 2 tablespoons butter; add onions and sauté until onions are tender, about 4 minutes.
Combine onions with chopped beef, cooked peas and carrots, potatoes, and gravy; set aside. Melt 1/4 cup butter in bottom of 8-inch square baking dish in 350° oven. Combine flour, cheese, sugar, baking powder, salt, and milk in a mixing bowl.Stir until blended. Pour into baking dish then pour beef mixture over the batter. Do not stir. Bake the beef pie for 55 to 65 minutes, until crust is browned and filling is bubbly.
Serves 5 to 6
Calories per serving: 520
Fat per serving: 24.8g