Pierce sweet potatoes with a fork and microwave until soft. Peel and mash. Set aside. Brown ground turkey.
In large bowl, mix sweet potatoes, ground turkey, and apples. Splash in 1-2 Tbsp orange juice and stir. If mixture is still too dry, add additional juice. You want this to be easy to scoop.
Spoon into 2 1/2 quart casserole dish and place in 350 °F oven. Cook for 30-45 minutes until heated through.