Heat oven to 375°F. In 10-inch skillet, mix cooked beef, beans and taco seasoning mix. Heat over medium-high heat, stirring occasionally, until hot. Set aside.
Separate dough into 4 rectangles. Place on ungreased cookie sheet. Press each to 8x5 inches, firmly pressing perforations to seal. Divide beef mixture evenly among rectangles. Bring ends up over filling, overlapping about 1 inch. Press edges with fork to seal. Place one-half slice cheese over each sandwich.
Bake 13 to 15 minutes or until golden brown. Immediately remove from cookie sheet. Serve warm.