Creating Cheesy Scalloped Potatoes is a straightforward process if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter.

2. Prepare the Potatoes: Peel the Russet potatoes and slice them thinly (about 1/8 inch thick). You can use a mandoline for uniform slices.

3. Make the Cheese Sauce: In a saucepan over medium heat, melt the butter. Add the minced garlic and sauté until fragrant (about 1 minute).

4. Add Cream and Milk: Pour in the heavy cream and whole milk. Stir to combine and bring to a gentle simmer.

5. Season the Sauce: Add salt, black pepper, dried thyme, and paprika to the cream mixture. Stir well.

6. Incorporate Cheese: Gradually mix in the shredded cheddar and Gruyère cheese until melted and smooth. Remove from heat.

7. Layer the Potatoes: Arrange half of the potato slices in the greased baking dish. Pour half of the cheese sauce over the potatoes.

8. Repeat Layers: Add the remaining potato slices on top and pour the rest of the cheese sauce over them, ensuring all potatoes are covered.

9. Bake: Cover the baking dish with aluminum foil and bake for 45 minutes. Remove the foil and bake for an additional 15 minutes, or until the top is golden and bubbly.

10. Cool and Serve: Once baked, let the dish cool for about 10 minutes before serving. Garnish with fresh parsley if desired.

These steps will guide you in creating Cheesy Scalloped Potatoes that are both delicious and satisfying.