Creating Scalloped Potatoes is as easy as following these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and butter a 9×13 inch baking dish.
2. Slice Potatoes: Peel and thinly slice the russet potatoes (about 1/8-inch thick) evenly.
3. Prepare Onions: Thinly slice the onion and set it aside.
4. Combine Cream and Garlic: In a medium saucepan, melt the butter over medium heat. Add minced garlic and sauté for 1 minute until fragrant.
5. Add Cream: Pour in the heavy cream and season with thyme, salt, pepper, and paprika (if using). Stir to combine and heat until just warm.
6. Layer Ingredients: In the prepared baking dish, layering begins; place a third of the potato slices at the bottom, followed by a layer of onions and a sprinkle of cheddar cheese.
7. Repeat Layers: Continue layering the potatoes, onions, and cheese until all ingredients are used, finishing with cheddar cheese on top.
8. Pour Cream Mixture: Carefully pour the warm cream mixture over the layered potatoes and cheese, making sure it covers everything evenly.
9. Bake: Cover the dish with foil and bake for 30 minutes. Remove the foil and bake for an additional 20-30 minutes, or until the potatoes are tender and the top is golden and bubbly.
10. Cool and Serve: Once done, allow the dish to cool for about 10 minutes before serving. This helps the sauce set slightly for easier serving.