2 medium Onions — Chopped
1/4 cup Butter or Margarine
2 cans Tuna — Drained 6-1/2oz
2 cups Shredded Cheddar Cheese
1 cup Biscuick
1 1/4 cups Milk
1/4 teaspoon Salt — If Desired
1/8 teaspoon Pepper
3 Eggs
2 Tomatoes — Thinly Sliced
Heat oven to 400~. Grease 8x8x2″ square baking dish. Cook onions and margarine in 10″ skillet over low heat, stirring occasionally, until onions are light brown. Sprinkle tuna, 1 cup of the cheese and the onions in plate. Beat Bisquick, milk, salt, pepper and eggs with wire whisk or hand beater until almost smooth, about 1 minute. Pour into plate. Bake until knife inserted in center comes out clean, 25 to 30 minutes. Top with tomato slices and remaining cheese. Bake until cheese is melted 3 to 5 minutes.