Bring turnips, potatoes, and salted water to cover to a boil in a Dutch oven; cook 15 to 20 minutes or until tender. Drain.
Cook bacon in a medium nonstick skillet over medium-high heat 5 to 6 minutes or until crisp; remove bacon, reserving 2 Tbsp. drippings in skillet. Crumble bacon. Sauté apples in hot drippings in skillet 6 minutes or until tender and lightly browned.
Combine apples, turnips, potatoes, Roasted Garlic, and thyme in a bowl; mash with a potato masher until blended. (Mixture will be chunky.) Stir in buttermilk and butter. Season with salt and pepper to taste. Transfer to a bowl.
Serve immediately, or, if desired, microwave mixture at HIGH 1 to 2 minutes or until thoroughly heated, stirring at 1-minute intervals. Sprinkle with bacon just before serving.
Kitchen Express: Substitute 2 tsp. jarred roasted minced garlic for 1/4 cup Roasted Garlic. Proceed with recipeas directed, sauteing garlic with apples in Step