Slow Cooker Chicken Parmesan Pasta

INGREDIENTS
4 boneless, skinless chicken breasts
2 (28 oz.) cans crushed tomatoes
1 yellow onion, finely chopped
1 1/2 tablespoons Italian seasoning
1/2 teaspoon red pepper flakes
1 (16 oz.) package penne pasta
1 1/2 cups mozzarella cheese, grated
1/3 cup freshly grated parmesan cheese
2 tablespoons fresh parsley, plus more for garnish
Kosher salt and freshly ground pepper, as needed

PREPARATION
Season chicken generously with salt and pepper and place in slow cooker.
In a separate bowl, stir together crushed tomatoes, diced onion, Italian seasoning and red pepper flakes, then pour into slow cooker and stir until chicken is fully coated.
Cover slow cooker and cook on high for 2 hours or on low for 4.
Bring a large pot of salted water to boil and prepare pasta according to package directions.
Remove and shred chicken, then return to slow cooker, along with cooked pasta.
Stir everything together, then top with cheeses.
Cover slow cooker and cook for another 10-20 minutes, or until cheese has melted.
Top with parsley and serve hot.

Recipe adapted from Damn Delicious.