Saute onion, garlic, mushrooms, and bell pepper until vegetables are softened. Add beans, tomatoes, spices, and wine. Simmer gently for 30 minutes.
Preheat oven to 350°. Mix ricotta cheese and yogurt toghether. oi a 1 1/2-quart baking dish;
layer tortillas, sauce, cheese, and cheese-yogurt mixture.
Repeat until all ingredients are used, ending with layer of sauce. Top
with cheese-yogurt mixture and black olives. Bake 15 to 20 minutes.
Calories per serving: 319
Fat per serving: 4.3g