Season 3-4 boneless, skinless chicken breasts, cut into 1-inch chunks evenly with 1/2 teaspoon salt, 1/2 teaspoon pepper and 1 teaspoon garlic powder. Set aside.
In a 5 quart (or larger) slow cooker, mix 2 (10.5 ounce) cans cream of chicken soup, 3/4 cup buffalo wing sauce and 1 medium red onion, finely diced.
Add the seasoned chicken to the sauce and stir well.
Cover and cook on low for 7-8 hours or on high for 3-4 hours (until chicken is thoroughly cooked).
After chicken has cooked, stir in 2 cups sour cream, 1/2 cup ranch dressing and 1 cup shredded mozzarella cheese. This will cool down the spicy flavors a bit and really add incredible creaminess!
Add 1 pound penne pasta, cooked to the buffalo chicken mixture in the low cooker. Stir together.
Allow the pasta to warm up slightly with the chicken then serve!
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Notes
About a half hour before serving, start the water for your pasta. While you're waiting for the water to boil, turn your slow cooker to low (if it isn't there already).