Tortellini in parmesan cheese sauce

Ingredients:

1 (16 ounce) package frozen cheese tortellini
1/3 cup butter or margarine
1 teaspoon flour
1/2 cup milk
1/2 cup grated Parmesan, mozzarella, Romano or Monterey Jack cheese
2 tablespoons chopped fresh parsley (optional)

Preparation:

Cook tortellini according to package directions. Drain.
Meanwhile, for sauce, heat milk in a medium saucepan.
While milk is heating, melt butter in a separate bowl in microwave. Stir flour and butter together.
Add mixture to milk. Cook and stir until slightly thickened and bubbly.
Add cheese. Cook and stir until well blended. Salt and pepper to taste.
Pour over tortellini. Stir gently. If desired, sprinkle with parsley.