In a large skillet, cook beef over medium heat for 8-10 minutes or until no longer pink, breaking into crumbles; drain. Stir in taco seasoning, salsa and corn; heat through. Transfer to an 11x7-in. baking dish; sprinkle with cheese.
In a small bowl, mix biscuit mix and milk just until blended; drop by tablespoonfuls over cheese. Sprinkle with pepper.
Bake, uncovered, at 350° for 35-45 minutes or until bubbly and topping is golden brown.