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 insert. Season with salt, black pepper, and Italian seasoning, tossing to coat.
03 - Scatter the minced garlic over the chicken and distribute the cubed cream cheese in small dollops across the top.
04 - Pour in the heavy cream and basil pesto sauce. Stir gently to combine all ingredients without disrupting the chicken layer.
05 - Cover and cook on the low setting for 3 hours, allowing the chicken to become tender and the flavors to meld.
06 - After 3 hours, add the refrigerated cheese tortellini, halved cherry tomatoes, and chopped spinach. Fold gently to incorporate without breaking the pasta.
07 - Sprinkle the shredded mozzarella and grated Parmesan evenly over the entire surface.
08 - Cover and continue cooking on low for an additional 30–45 minutes, until the tortellini is tender and the cheese is fully melted and bubbly.
09 - Stir thoroughly before serving to distribute the melted cheese and sauce evenly. Taste and adjust seasoning if needed.