Step 1

Preheat oven to 400°. Cook pasta according to package directions for al dente. Drain, reserving 1/3 cup pasta water; return all to pot.

Step 2

Meanwhile, in a large skillet, cook and crumble chicken with onion, 1/2 teaspoon garlic powder and remaining seasonings over medium-high heat until no longer pink, 5-7 minutes. Stir in tomatoes; bring to a boil. Add to pasta; toss to combine. Transfer to a 13x9-in. baking dish coated with cooking spray.

Step 3

Mix cream cheese, sour cream, 1/2 cup mozzarella cheese and remaining garlic powder. Drop mixture by tablespoonfuls over pasta. Sprinkle with remaining mozzarella cheese.

Step 4

Bake, uncovered, until cheese is melted, 8-10 minutes. If desired, sprinkle with parsley and pepper flakes.