Cook the boneless skinless chicken breasts in a slow cooker with 1 cup of chicken broth for 3 hours on high or 6 hours on low. Season with salt and pepper.
Once the chicken is cooked, remove it from the slow cooker and shred it. You can strain the leftover broth for later use in the soup.
In a large saucepan, sauté the chopped green pepper, onion, and minced garlic in 1 tablespoon of butter until translucent. Tip: Stir occasionally to prevent the garlic from burning.
Mash the cream cheese into the sautéed veggies until it melts and combines smoothly.
Add the canned tomatoes, remaining 2½ cups of chicken broth, heavy whipping cream, and taco seasoning to the saucepan.
Simmer the mixture on low, uncovered, for 20 minutes. Tip: Keep an eye on it and stir occasionally to prevent sticking.
Add the shredded chicken to the saucepan, cover, and simmer for an additional 10 minutes.
Season with salt and pepper to taste. Serve hot! Tip: For added richness, consider topping with shredded cheese or avocado.
Notes
For a spicier kick, consider adding a dash of hot sauce or red pepper flakes to the soup. No alcoholic drinks allowed, please substitute with a non-alcoholic option.