01 - Lightly grease the slow cooker insert with nonstick spray or butter to prevent sticking.
02 - Arrange the cubed chicken breasts evenly across the bottom of the slow cooker. Sprinkle with salt, black pepper, and Italian seasoning, tossing lightly to coat.
03 - Scatter the minced garlic over the seasoned chicken. Distribute the cubed cream cheese in even dollops across the top.
04 - Pour in the heavy cream and basil pesto sauce. Stir gently to combine all ingredients without disturbing the chicken layer too much.
05 - Cover and cook on the low setting for 3 hours, allowing the chicken to become tender and the flavors to meld together.
06 - After 3 hours, add the refrigerated cheese tortellini, halved cherry tomatoes, and chopped spinach to the slow cooker. Fold gently into the mixture.
07 - Sprinkle the shredded mozzarella and grated Parmesan cheese evenly over the entire surface.
08 - Cover and continue cooking on low for an additional 30 to 45 minutes, until the tortellini is tender and the cheese is fully melted and bubbly.
09 - Stir everything together gently before serving. Taste and adjust salt and pepper as needed.