01 - Place chicken breasts in the bottom of a 5-6 quart slow cooker. Add sliced carrots, diced onion, minced garlic, chicken broth, dried Italian herbs, salt, and pepper. Stir gently to distribute ingredients.
02 - Cover and cook on low setting for 6–7 hours or on high setting for 3–4 hours, until the chicken is tender and cooked through.
03 - Remove the cooked chicken breasts from the slow cooker. Use two forks to shred the meat, then return the shredded chicken to the pot.
04 - Stir in the evaporated milk (or half-and-half) and the cubed cream cheese. Mix thoroughly until the cream cheese has melted and the sauce is smooth.
05 - Add the tortellini and baby spinach to the slow cooker. Stir, cover, and cook on high heat for an additional 15–20 minutes, or until the tortellini is tender and the spinach has wilted.
06 - Stir in the Parmesan cheese just before serving. Taste the dish and adjust seasoning with salt and pepper if necessary.