Making Creamy Scalloped Potatoes is simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray.
3. Slice Potatoes: Peel and thinly slice the potatoes using a mandoline for uniform thickness.
4. Cook Onions and Garlic: In a skillet over medium heat, melt the butter. Add the chopped onion and garlic, cooking until fragrant and softened, about 3-5 minutes.
5. Make the Sauce: Stir in the flour, salt, pepper, and paprika. Gradually add the heavy cream and milk, whisking continuously until the mixture thickens, about 4-5 minutes.
6. Layer the Potatoes: Arrange half of the sliced potatoes in the bottom of the prepared baking dish. Pour half of the sauce mixture over the potatoes and sprinkle half of the shredded cheese on top.
7. Repeat Layers: Add the rest of the potato slices, pour the remaining sauce over, and top with the remaining cheese.
8. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 45 minutes. Then, remove the foil and bake for an additional 15 minutes or until the potatoes are tender and the top is golden brown.
9. Garnish: Remove from the oven and let it cool for a few minutes. Optionally, sprinkle with chopped fresh parsley for added color.
10. Serve and Enjoy: Cut into squares and serve warm!

These steps will guide you in creating the incredibly rich and creamy scalloped potatoes that everyone will love.