1.In a large pot of boiling salted water, cook tortellini according to package instructions; drain.

2.Meanwhile, in a large skillet, heat oil over medium-low heat. Add mushrooms and garlic; cook, stirring frequently, until mushrooms are tender, about 7 minutes.

3.Add 1 cup water; season with salt and pepper. Cook until liquid is reduced by half, about 5 minutes. Remove from heat; add tortellini, Parmesan, butter, and parsley. Toss to coat; serve.