1 (16 ounce) can refried beans 1 pound ground beef 1 (1.25 ounce) package taco seasoning mix 1 tablespoon vegetable oil 4 (6 inch)corn tortillas 8 ounces shredded Cheddar cheese 8 tablespoonssour cream 2roma (plum) tomatoes, chopped 2green onion, chopped 1 (4 ounce) candiced green chiles, drained 1/2avocado, diced 1 tablespoonblack olives, sliced Directions Heat