Bring a large pot of salted water to a boil. Cook tortellini just to al dente according to package directions. When done, drain and set aside.
1 18-20 ounce package refrigerated tortellini
While the tortellini cooks, make the sauce. Melt butter in a large skillet over medium-high heat, then whisk in the flour and cook for 60 seconds.
3 Tablespoons butter, 1 Tablespoon flour
Reduce heat to medium and whisk in the broth and lemon juice.
3/4 cup chicken broth, 1 teaspoon lemon juice
Add cream, garlic powder, salt, nutmeg, and pepper. Whisk until smooth, then let the sauce simmer for 1-2 minutes to thicken slightly.
1 cup heavy cream, 1/2 teaspoon garlic powder, 1/2 teaspoon salt, 8-10 cranks freshly-ground black pepper, 1/8 teaspoon ground nutmeg
Stir in the Parmesan and let it melt until the sauce smooths out once again. If the sauce is too thick for your liking, add a bit more broth or cream. Taste and add more salt or pepper as desired. Stir in the chicken and let it warm through for 1-2 minutes, then stir in the cooked tortellini. Serve right away!
3/4 cup freshly-grated Parmesan cheese, 1-2 cups shredded cooked chicken