Preheat your oven to 400 degrees F.
Add the chopped sweet potato, turnip, and onion to a mixing bowl, drizzle with olive oil, and sprinkle in the Italian seasoning, garlic powder, paprika, and sea salt. Toss everything until well-coated.
Spread the seasoned vegetables over a large cast iron skillet, baking sheet, or casserole dish in a single layer.
Place beets in the center of a 12-inch piece of foil and fold edges over to create a secure packet.
Place both the skillet of vegetables and the foil packet in the preheated oven and roast for about 40 minutes, turning beets and turnips halfway through.
Carefully remove the vegetables from the oven. Open the foil packet of beets cautiously, as hot steam will escape.
Use a slotted spoon to scoop the beets out of their juices and add them to the skillet with the other veggies, stirring to combine.
Serve your fragrant and colorful Oven Roasted Root Vegetables alongside your favorite main dish.