Creating Cheese Sprout Gratin is simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Brussels Sprouts: In a large bowl, toss the halved Brussels sprouts with olive oil, salt, and pepper until well coated.
3. Blanch Sprouts: In a pot of boiling salted water, blanch the Brussels sprouts for about 5 minutes. Drain and set aside.
4. Make Cheese Sauce: In a saucepan, heat the heavy cream over medium heat. Stir in the shredded cheese, garlic powder, onion powder, and nutmeg (if using). Mix until the cheese has melted and the sauce is smooth.
5. Combine: In a large baking dish, combine the blanched Brussels sprouts and cheese sauce. Mix well to ensure all the sprouts are coated.
6. Top with Parmesan: Sprinkle the grated Parmesan cheese evenly over the top of the mixture.
7. Bake: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the top is golden and bubbly.
8. Garnish: Remove from the oven and let it cool for a few minutes. Garnish with fresh herbs before serving.

This step-by-step guide will help you create a delicious Cheese Sprout Gratin that your family and friends will love.