Step 1

Combine all the ingredients for the fajita seasonings. Reserve 1 1/2 teaspoons for the bell peppers.

Step 2

In a medium bowl, combine 2 tablespoons of olive oil, chopped cilantro, lime juice, mustard and 5 teaspoons of the fajita seasonings. Reserve 1 tablespoon of the chicken marinade for drizzling on the chicken at the end. Pour remainder of the marinade into a large zip-top bag along with the chicken. Press the bag to evenly distribute the marinade and allow to sit while you prepare the vegetables.

Step 3

Slice the the onions and bell peppers.

Step 4

Heat 1 tablespoon butter in a 12" skillet over medium high heat. Add the onions and allow to cook for about 5 minutes, or until softened and fragrant. Add the bell peppers and sprinkle with the reserved 1 1/2 teaspoons of fajita seasonings. If you like the peppers with a nice crunch - cook for about 3-5 minutes. And if you like them softer, leave them on for about 3 minutes longer. Transfer and set aside on a plate.

Step 5

Melt remaining 1 tablespoon butter on the same skillet and brown the chicken. Cook for 5-6 minutes, or until cooked through. Add the reserved chicken marinade to the skillet and cook for an additional 30 seconds. Remove from heat.

Step 6

Serve over some lettuce, cauliflower rice and with sliced avocados and lime wedges.