Rinse chiles, open flat and remove seeds. Drain on paper towels. Brown meatwith onion and garlic. Drain. Add 1 tsp cumin, 1.5 tbs chili powder andsalt. Stir. In a greased 9x13 inch pan, layer chiles, beef and additionalchiles. Combine cheeses and sprinkle over chiles. Beat together eggs, milkand flour. Pour over cheese mixture. To the tomato sauce add 2 tsp cuminand 1.5 tbs chili powder. Pour over all. Bake 30-45 min at 180ºC . (Note: Ifpreparing ahead of time, do not cover with tomato sauce until time tobake.) Serve toppings in seperate bowls and let guests help themselves.