2 md Onions, chopped
1 c  Bisquick baking mix
1 1/4 c  Milk
1/4 c  Butter
1/8 ts Pepper
2 cn (6 1/2 oz) tuna, drained
3    Eggs
2    Tomatoes, thinly sliced
2 c  Shredded Cheddar cheese

Heat oven to 400 degrees.Grease square baking dish,8 x 8 x 2″. 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
dish. Beat baking mix,milk,pepper and eggs with wire whisk or hand beater
until almost smooth,about 1 minute.Pour into dish. 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.Cool 5
minutes.Serves 6 to 8.