Preheat oven to 350°. In a nonstick skillet, cook and stir onion and green pepper in broth until tender, 2-3 minutes. Mash 1 can of black beans. Add to skillet with 3/4 cup of picante sauce and remaining beans; heat through., Spoon 1/4 cup mixture down the center of each tortilla. Roll up and place, seam side down, in a 13x9-in. baking dish coated with cooking spray. Combine tomatoes and remaining picante sauce; spoon over enchiladas., Bake, covered, 15 minutes. Uncover; sprinkle with cheeses. Bake 5 minutes longer. Serve with lettuce and sour cream.