Add 1 bell pepper and half the sliced onion to bottom of crockpot. Add chicken on top and season with half or the full packet of taco/fajita seasoning. Add Frontera skillet sauce and remaining bell pepper and onion strips. Sprinkle on garlic and lime. Cook for 3-4 hours on low or 2-3 hours on high. Drain any excess liquid you do not want before serving or use a slotted spoon for draining.
Assemble your fajitas on tortillas with any additional toppings such as shredded cheese, sour cream and guacamole!