Heat oven to 375°F. If using dough sheets: Unroll dough; press each sheet into 12x8-inch rectangle. If using crescent rolls: Unroll dough into 3 large rectangles; press each into 12x8-inch rectangle, firmly pressing perforations to seal. Cut each rectangle into 6 (4-inch) squares. Gently press squares into 18 ungreased regular-size muffin cups.
In 12-inch skillet, cook beef over medium-high heat 5 to 7 minutes, stirring occasionally, until thoroughly cooked; drain. In medium bowl, mix beef, taco seasoning and beans. Divide evenly among dough cups. Sprinkle with cheese blend.
Bake 18 to 22 minutes or until edges are golden brown. Cool 5 minutes. Run knife around edge of muffin cups to loosen. Remove from pan. Top with lettuce, sour cream and salsa. Serve warm.