Creating cheesy scalloped potatoes is straightforward, especially when you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish.
2. Prepare Potatoes: Wash, peel, and thinly slice the potatoes into rounds about 1/8 inch thick.
3. Sauté Onions and Garlic: In a skillet over medium heat, melt the butter. Add the chopped onion and sauté until translucent, about 4-5 minutes. Stir in garlic and cook for another minute.
4. Make the Sauce: Sprinkle the flour over the onions and stir for about 1 minute. Gradually add the milk and cream, whisking continuously until the mixture thickens. Add salt, black pepper, and paprika, then remove from heat.
5. Layer Potatoes: Spread half of the sliced potatoes in the bottom of the prepared dish. Pour half of the cheese sauce over the potatoes. Sprinkle 1 cup of cheese on top.
6. Repeat Layers: Add the remaining potatoes in a second layer, followed by the remaining cheese sauce. Top the dish with the remaining cheese.
7. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 45 minutes. Remove the foil and bake for an additional 15-25 minutes, or until the potatoes are tender and the top is golden and bubbly.
8. Cool: Once baked, allow the dish to cool for about 10-15 minutes before serving to help it set.
9. Garnish: If desired, sprinkle fresh parsley on top for added color and taste.

These straightforward steps will guide you to creating a comforting and delicious dish of cheesy scalloped potatoes that will impress all who indulge!