Preheat oven to 325 degrees.
In large bowl, combine green chiles and cheeses.
Turn into well-buttered shallow 12- by 9-inch 2-quart casserole.
Beat egg whites just until stiff peaks form.
Combine yolks, milk, flour, salt and pepper, mixing until well-blended.
Using rubber spatula, gently fold beaten whites into yolk mixture.
Pour egg mixture over cheese mixture in casserole, using a fork to "ooze" it through cheese.
Bake 30 minutes; remove from oven and arrange sliced tomatoes overlapping around outer edges.
Bake 30 minutes longer, or until a knife inserted in center comes out clean.
Garnish with chopped green chiles, if desired.
Serve with chips, salsa and refried beans.
Makes 6 servings.
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