Creating the perfect cheesy scalloped potatoes is a simple and rewarding process. Follow these easy steps to achieve that creamy, cheesy goodness:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Dish: Grease a 9×13-inch baking dish with butter to prevent sticking.
3. Layer Potatoes: Arrange half of the sliced potatoes in the bottom of the baking dish, overlapping them slightly.
4. Add Onions: Sprinkle half of the chopped onions over the potatoes.
5. Season: Season with salt, pepper, and paprika to taste.
6. Add Cheese: Sprinkle one cup of shredded cheddar cheese over the potatoes and onions.
7. Repeat Layers: Repeat the layers with the remaining potatoes, onions, cheese, salt, and pepper.
8. Prepare Sauce: In a saucepan, combine the heavy cream, whole milk, and minced garlic over medium heat. Stir until warmed through, but do not bring to a boil.
9. Pour Sauce: Pour the cream mixture evenly over the layered potatoes and cheese in the baking dish.
10. Add Butter: Dot the top with small pieces of butter for extra richness.
11. Cover and Bake: Cover the dish with aluminum foil and bake for 45 minutes.
12. Uncover and Brown: Remove the foil and bake for an additional 15 minutes or until the top is golden brown and the potatoes are tender when pierced with a fork.
13. Garnish: Remove from the oven and let cool for a few minutes. Sprinkle with fresh parsley before serving.

These straightforward steps will guide you in creating a dish that is not only delicious but also visually appealing.