Bring a large pot of salted water to a boil.
Add the tortellini to the water and cook according to package directions until al dente, usually 2 to 5 minutes.
While the pasta cooks, melt the butter in a large skillet over medium-low heat.
Add the minced garlic to the skillet and sauté for 1 minute until aromatic but not browned.
Whisk in the heavy cream and bring to a gentle simmer for 3 to 5 minutes until the sauce thickens slightly.
Reduce heat to low and whisk in the Parmesan cheese until fully melted and the sauce is smooth.
Season the sauce with nutmeg, salt, and pepper.
Drain the cooked tortellini and add them directly to the skillet with the sauce.
Gently toss the tortellini to ensure even coating and garnish with chopped parsley before serving.