Step 1

Bring a large skillet sprayed with nonstick spray to medium-high heat. Add beef, onion, taco seasoning, salt, and pepper. Cook, stir, and crumble until beef is fully cooked and onion has softened, about 5 minutes.

Step 2

Remove skillet from heat. Add refried beans, and mix well.

Step 3

Fill lettuce leaves with beef mixture, tomato, cheese, and sour cream.