You are not going to believe how easy it all comes together in under an hour!
This is a comforting side dish combining root vegetables with two different kinds of cheeses in a creamy white sauce!
Preheat oven to 400°F. Peel and slice your vegetables, and add to 3 separate bowls.
Add heavy cream and parmesan to each bowl. Add some of the thyme along with salt and pepper. Toss to evenly coat.
Arrange in the cast iron skillet. Pour what was left of the heavy cream mixture from the parsnips and sweet potato bowl over the sliced veggies.
Cover and bake in the oven for 40-45 minutes.
Remove cover and top with parmesan and the gruyere. Place under broiler for 3 minutes. Serve and enjoy!