In a skillet, cook and crumble ground beef until no longer pink; drain. In a bowl, combine biscuit mix, bacon and cheese; stir in cooked beef. Add buttermilk and toss with a fork until just moistened. Shape into 1-1/2-in. balls. (I used a medium cookie scoop) Place 2 inches apart on ungreased baking sheets.
Bake for 12-15 minutes or until puffed and golden brown. Cool on wire racks.
Baked puffs may be frozen; reheat at 400 degrees F for 7-9 minutes or until heated through (they do not need to thawed first).