Place the chicken breast along with ALL of the ingredients in your slow cooker. Cook on low for 6 hours or high for 3 hours. Remove the chicken from the slow cooker. Shred the chicken, then return the meat to the cooker and mix well. Season with salt and pepper to taste.
Tortilla Strips
Preheat oven to 350°F. Place parchment paper or silicone mat on a baking sheet. Cut the corn tortillas into strips. Place them in a bowl, add olive oil and toss until well coated. Transfer the tortilla strips to the baking sheet. Bake for 5-8 minutes or until lightly golden. Remove the strips and let cool before serving.
Serve
Pour soup into a bowl and add corn tortillas strips on top. Garnish with cheese, sour cream, chopped cilantros, lime juice, jalapeños or sliced avocados.