Prep the Chicken: If using chicken breasts, slice them into strips for quicker cooking. If you're using beef, ensure they are thinly sliced.
Layer Ingredients: In the crockpot, layer the sliced bell peppers and onion at the bottom.
Add Chicken: Place the sliced chicken (or beef) on top of the vegetables.
Flavor Boost: In a small bowl, combine the minced garlic, diced tomatoes, fajita seasoning, olive oil, and a pinch of salt and pepper. Pour this mixture evenly over the chicken and vegetables in the crockpot.
Cook: Cover and cook on low for 6-8 hours or on high for 4 hours, until the meat is tender and fully cooked.
Shred and Serve: Once done, shred the chicken or beef using two forks right in the crockpot for a more flavorful mix. Stir everything together to combine.
Assemble Tortillas: Serve the fajita mixture in warmed tortillas and top with your choice of avocado, sour cream, cheese, cilantro, and lime juice.
Notes
Serve the fajitas on a large platter with toppings arranged separately for customization.