Heat oven to 350¯F. In a large bowl, combine chili, diced tomatoes, 1 cup shredded cheese, and onion. Fill each tortilla with chili mixture. Fold burrito-style. Place on a baking sheet. Bake 8–10 minutes until hot. Serve with lettuce, remaining cheese, lettuce, sour cream, and salsa. Makes 6 servings.