Preheat oven to 375° F.
Grease a 2 ½ quart glass baking dish. (mine is 7 x 9" pyrex)
Heat oil and saute onions, garlic, Anaheim and bell pepper over medium-high heat for 3 minute.
Add tomatoes & their juice, salt & pepper. Cook, uncovered, for 2 minutes.
Stir in black beans. Remove from heat.
Make 3 layers in this order: tortillas + tomato mixture + cheese.
Bake, uncovered, for 20 minutes. Serve with sour cream.
