Preheat oven to 375 F (191 C).
Peel and slice potatoes
Smear butter all over the inside of your baking dish. Make sure your butter is at least room temperature or warmer (you can zap it in the microwave for a few seconds to warm up).
Add the heavy cream, garlic powder, and salt to the baking dish. Mix well.
Arrange the potato slices in the baking dish or if you are lazy, just dump it in the baking dish, it will still taste delicious!
Mix the heavy cream and potato slices. Make sure all potato slices are coated with heavy cream.
Top the potato slices with grated parmesan cheese or gruyere cheese. If you don’t have that, you can use any shredded cheese you like.
Bake in the oven for approximately 30 minutes. Keep an eye on it, the key is to get the cheese bubbly and brown.
Remove from the oven. Serve and enjoy.