Pour the 28 oz of marinara sauce and 15 oz of Alfredo sauce into the crockpot.
Place the three chicken breasts into the sauce mixture. Sprinkle the chicken with onion powder and garlic powder.
Set your crockpot to cook on high for 3 hours or low for 6 hours.
Once the chicken is fully cooked, use two forks to shred it directly in the crockpot.
Cook the pasta separately according to the package instructions. Drain the pasta and add it to the crockpot with the shredded chicken and sauce. Stir everything together, allowing the pasta to soak up the delicious flavors.
Sprinkle a generous amount of mozzarella cheese over the pasta and chicken mixture. Cover the crockpot for a few minutes to allow the cheese to melt.
Enjoy!