01 - Lightly grease the inside of a 5-6 quart slow cooker with cooking spray or a thin coat of oil.
02 - Spread the cubed chicken evenly across the base of the slow cooker. Season with salt and freshly ground black pepper.
03 - Scatter the finely chopped onion and minced garlic over the seasoned chicken.
04 - Arrange the halved cherry tomatoes and roughly chopped baby spinach over the aromatics.
05 - In a mixing bowl, whisk together the heavy cream, low-sodium chicken broth, and basil pesto sauce until smooth and well combined.
06 - Pour the pesto cream mixture evenly over the layered ingredients in the slow cooker.
07 - Sprinkle 1 cup of shredded mozzarella and 1/4 cup of grated Parmesan over the sauce.
08 - Stir gently to combine all ingredients. Cover and cook on LOW for 3 hours.
09 - After 3 hours, gently fold in the refrigerated cheese tortellini until evenly distributed.
10 - Re-cover and continue cooking on LOW for another 45 minutes to 1 hour, until the tortellini are tender and the chicken is cooked through.
11 - Scatter the remaining mozzarella and Parmesan over the top. Cover and let the cheese melt for 5 minutes before serving.
12 - Finish with a sprinkle of crushed red pepper flakes and fresh basil leaves if desired.