In an extra-large skillet cook potatoes, onion, and garlic in hot butter over medium-high heat 8 minutes or until nearly tender. Stir in meat. Cook and stir 3 minutes more or until meat is desired doneness; remove meat and potatoes to plate. Cover; keep warm.
In same skillet cook apples, cut side down, in drippings 2 minutes or until browned. Stir in apple juice. Bring to boiling; reduce heat. Simmer, covered, 6 to 8 minutes or until tender; remove from skillet with slotted spoon to plate. Cover; keep warm.
Remove skillet from heat. For sauce, whisk sour cream, salt, and pepper into juices in skillet until smooth. Spoon sauce over steak, potatoes, and apples. Makes 4 servings.