Step 1: Add the Chicken - Place the chicken breast in the bottom of your crock pot in an even layer. I like to set it down first so it has plenty of contact with the sauce as it cooks. No need to cut it up at this point. The slow cooker will do the work for you, and the chicken will be much easier to shred once it has cooked until tender.
Step 2: Pour in the Sauce and Broth - Add the marinara sauce and chicken broth right over the chicken. The marinara brings the tomato flavor, while the broth loosens everything up so the chicken can cook gently without drying out. Give the crock pot a small tilt or use a spoon to make sure the liquid settles around the chicken. It does not have to look perfect. This is slow cooker cooking, not a cooking show.
Step 3: Season the Sauce - Sprinkle in the garlic powder, onion powder, Italian seasoning, paprika, and red pepper flakes. These pantry seasonings are simple, but together they make the sauce taste like you spent more time on it than you did. I usually sprinkle everything evenly over the top, then gently stir the sauce around the chicken. The goal is to get those seasonings into the liquid so they can flavor the chicken while it cooks.
Step 4: Slow Cook Until Tender - Cover the crock pot and cook on high for 3 to 4 hours or on low for 6 to 8 hours. The chicken is ready when it is cooked through and shreds easily with two forks. I tend to use low when I am starting dinner in the morning, and high when I realize around lunchtime that everyone still expects to eat later. Either way works.
Step 5: Shred the Chicken - About one hour before the cooking time is finished, remove the chicken from the crock pot and place it on a cutting board or plate. Shred it with two forks, then return it to the sauce. This is the moment when the dish really starts coming together. The shredded chicken soaks up that seasoned marinara, and every bite gets a little bit of everything.
Step 6: Add the Tortellini and Cheese - For the final hour of cooking, add the cheese tortellini, mozzarella, heavy cream, and grated parmesan. Stir gently so the tortellini is coated in the creamy tomato sauce. Try not to stir too aggressively because tortellini can be a little delicate once it starts cooking. The mozzarella melts into the sauce, the parmesan adds flavor, and the cream turns everything into the kind of dinner people remember.
Step 7: Finish Until Tender and Serve - Let everything cook until the tortellini is tender and the sauce is creamy and hot. Sprinkle extra mozzarella on top during the last few minutes if you want a cheesier finish. Once it is ready, scoop it into bowls and serve it warm. I like to let it sit for a few minutes before serving because the sauce thickens slightly and nobody burns their tongue trying to be first.