Tuna Melt Pie

Directions

1. 1
   Heat oven to 400F (200C).
2. 2
   Grease square baking dish, 8 x 8 x 2 inches.
3. 3
   Cook onions and margarine in 10 inch skillet over low heat, stirring occasionally, until onions are light brown.
4. 4
   Sprinkle tuna, 1 cup of the cheese and the onions in dish.
5. 5
   Beat baking mix, milk, pepper and eggs with wire whisk or hand beater until almost smooth, about 1 minute.
6. 6
   Pour into dish.
7. 7
   Bake until knife inserted in center comes out clean, 25 to 30 minutes.
8. 8
   Top with tomato slices and remaining cheese.
9. 9
   Bake until cheese is melted, 3 to 5 minutes.
10. 10
    Cool 5 minutes.