Preheat the oven to 400°F. Line a baking sheet with parchment paper.

In a large bowl, combine the ground beef, grated Parmesan cheese, breadcrumbs, milk, egg, minced garlic, dried parsley, salt, and pepper. Mix gently until well combined.

Shape the mixture into 1 1/2-inch meatballs and place them on the prepared baking sheet.

Bake the meatballs for 20-25 minutes, or until they are cooked through and lightly browned.

While the meatballs are baking, prepare the Alfredo sauce. In a large saucepan, melt the butter over medium heat. Add the minced garlic and cook until fragrant, about 1 minute.

Pour in the heavy cream and bring the mixture to a simmer. Reduce the heat to low and simmer gently for 5 minutes, stirring occasionally.

Gradually stir in the grated Parmesan cheese, salt, and pepper. Continue to simmer the sauce, stirring constantly, until the cheese has melted and the sauce has thickened, about 3-4 minutes.

Remove the saucepan from the heat and add the cooked meatballs to the Alfredo sauce, stirring gently to coat the meatballs evenly.

Garnish with chopped fresh parsley, if desired.