To prepare sauce, blend tomatoes and their liquid with onion and garlic, in a blender or food processor. Pour into medium sized saucepan. Add red pepper, salt ant tomato paste. Heat to a boil; then simmer for 5-10 minutes.

Place 3 tortillas in bottom of Crock-pot. Layer on tortillas 1/3 of the ground beef, 1/3 of the tomato sauce and 1/3 of the Cheddar cheese. Repeat each layer two more times. Cover and cook on low 6-8 hours.