Step 1

Preheat oven to 350 degrees.

Step 2

Heat a saucepan on medium heat and add the butter.

Step 3

When melted, add the garlic and cook for a couple of minutes until fragrant.

Step 4

Add in the cream cheese, whipping cream, Parmesan reggiano, and 1/2 cup shredded cheddar cheese. Stir. Add in the onion powder, salt, and pepper to taste. Taste the sauce repeatedly and adjust the flavor to taste as needed.

Step 5

Stir continuously until the cheese has melted.

Step 6

Remove from the heat and set aside.

Step 7

Arrange the sliced sweet potatoes in rows throughout a 9×13 baking dish. Drizzle the cheese sauce throughout.

Step 8

Sprinkle the remaining 1/2 cup of shredded cheddar and the mozzarella throughout the pan.

Step 9

Cover with foil and bake for 30 minutes.

Step 10

Remove the foil and bake an additional 25 minutes until the sweet potatoes are tender.

Step 11

If you like a crisp top, a couple of minutes before the dish has finished baking, turn on the Broil function on the oven. Broil for 1-3 minutes until the top has crisped

Step 12

Cool for 30 minutes before serving.