Ingredients: Cooking Spray, to coat, FILLING, Cooked navy beans, (1 can), Chopped onion, (1 1/2 - 2, Garlic cloves, Beer, Ground red pepper, (1/4 to 1, Canned tomatoes, drained and, OPTIONAL, Cooked potato, chopped, Cooked rice, (1/2 - 1 cup), Chopped green chiles, (2 -, Roasted red peppers, (1/2 to, WHITE SAUCE, All-purpose flour, Salt, Ground cumin, (1/2 -1 tsp), Ground coriander, (1/4 to, Skim milk, Egg whites, lightly beaten, Nonfat mozzarella cheese,, Corn tortillas, (6-inch) cut, GARNISHES, Yogurt, or sour cream, Salsa, ...