Step 1: Prepare the Crockpot: Spray the inside of the crockpot with non-stick cooking spray. This helps prevent sticking and makes cleanup easier.
Step 2: Arrange Chicken Tenderloins: Place the chicken tenderloins in a single layer at the bottom of the prepared crockpot. Avoid overlapping the chicken as much as possible for even cooking.
Step 3: Add Sauce and Seasonings: Pour the marinara sauce over the chicken tenderloins, ensuring they are mostly covered. Sprinkle the Italian seasoning, garlic powder, and red pepper flakes (if using) evenly over the sauce.
Step 4: Slow Cook: Cover the crockpot and cook on low for 6-8 hours or on high for 3-4 hours. Cooking times may vary depending on the specific crockpot model, so check for doneness. The chicken should be very tender and easily shredded with a fork.
Step 5: Shred Chicken (Optional): Once the chicken is cooked through, use two forks to shred it directly in the crockpot. This allows the shredded chicken to absorb more of the sauce. If preferred, chicken tenderloins can be served whole.
Step 6: Serve: Serve the crockpot chicken and sauce over cooked pasta, rice, or vegetables. Sprinkle with Parmesan cheese (if using) before serving. Enjoy this flavorful and easy meal.
For a creamier sauce, add 1/4 cup of heavy cream or cream cheese during the last 30 minutes of cooking. Chicken broth can be used in place of marinara sauce, add herbs for a different flavor.