Making Cheesy Au Gratin Potatoes involves several simple steps. Follow this guide for an effortless culinary experience:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Dish: Grease a 9×13 inch baking dish with butter.
3. Layer Potatoes: Arrange the thinly sliced potatoes in the dish, overlapping them slightly.
4. Mix Cream and Cheese: In a medium saucepan, combine heavy cream, minced garlic, salt, pepper, and thyme. Heat over medium until warm.
5. Add Cheese: Remove the saucepan from heat and stir in the cheddar and Parmesan cheese until melted and smooth.
6. Pour Mixture: Pour the creamy cheese mixture evenly over the potatoes, ensuring they are well-coated.
7. Cover and Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 45 minutes.
8. Uncover and Brown: After 45 minutes, remove the foil and bake for an additional 15 minutes, or until the top is golden brown and bubbly.
9. Cool Slightly: Remove from the oven and let the dish cool for about 10 minutes before serving.
10. Garnish: Sprinkle with paprika and chopped parsley before serving for an added touch of color.

Following these steps ensures that your Cheesy Au Gratin Potatoes come out perfectly every time.