Rinse chilies, open flat and remove seeds. Drain on paper towels. Brown meat with onion and garlic. Drain. Add 1 tsp cumin, 1-1/2 tablespoons chili powder and salt. Stir. In a greased 9x13" pan, layer chilies, beef and additional chilies. Combine cheeses and sprinkle over chilies. Beat together eggs, milk and flour. Pour over cheese mixture. To the tomato sauce add 2 tsp cumin and 1-1/5 tablespoons chili powder. Pour over all. Bake 30-45 min at 350 F. (Note: If preparing ahead of time, do not cover with tomato sauce until time to bake.) Serve toppings in separate bowls and let guests help themselves.