Mixing the Marinade: Finely chop the chipotle chilies, add them to the bowl with the remaining marinade ingredients and stir to combine. Cover and set aside.

Prepping the Chicken: Cover a cutting board with parchment paper or plastic wrap and cover with another piece of parchment or plastic wrap. (you can also use a plastic zip bag).

Using the flat side of a mallet, heavy pan, or rolling pin, pound the chicken breast using short strokes starting with the thickest part of the chicken working your way toward the edge. Flip the breast and repeat. Continue pounding until the chicken breast is ½ to ¼ inch thick.

Marinading the Chicken: Place the chicken into a gallon sized zip bag. Add ⅓ cup of the marinade sauce to the bag, zip the bag and massage to coat the chicken. If you prefer you can marinate the chicken breast in a large mixing bowl. Cover the remaining marinade and save for serving later.

Place the chicken in a flat rimmed baking sheet or pan so that the bag is flat. Allow the chicken to marinate for 1 hour or overnight in the fridge.

Take the Chill Off: Take your chicken out of the fridge 20-30 minutes before grilling. Grilling ice cold chicken can lead to  overcooking.

Preparing the Grill Pan: Heat the grill pan on medium-high heat. When the grill pan is hot, brush a bit of oil on the pan, making sure to coat the entire pan with oil.

Grilling the Chicken: Add the chicken breast to the grill pan and cook for 4-5 minutes on the first side without moving, until the underside develops dark grill marks. Flip the chicken using a pair of tongs or a fork and cook the other side another 4-5 minutes. (To make sure your chicken is safe to eat, use a thermometer to check the internal temperature reaches 165 degrees.). Remove from pan and allow chicken to rest and cool a bit before slicing and serving.

Serving Chicken: Serve your chicken with some of the remaining marinade sauce. You can leave your chicken breast whole or slice. This grilled chicken pairs well with vegetables, pastas, and salads. It also makes tasty chicken tacos.