Heat a large nonstick skillet over medium heat. Coat the pan with cooking spray. Add bell pepper, chopped onion, and crumbles; cook 5 minutes, stirring occasionally. Remove 1 chile and 1 tablespoon sauce from can; reserve remaining chiles and sauce for another use. Chop chile; add chile, sauce, beans, and tomatoes to pan. Cover, reduce heat, and simmer 5 minutes. Remove from heat; stir in cilantro. Arrange 1 1/3 cups chips on each of 6 plates. Top each serving with 1 cup bean mixture, 1/3 cup lettuce, about 2 1/2 tablespoons avocado, 2 tablespoons onion, 2 tablespoons cheese, and 1 tablespoon sour cream.
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