Margarita Chicken

Ingredients
zest from one lime
1/3 cup fresh lime juice, from about 4 limes
1/4 cup olive oil
2 tablespoons tequila, optional
2 tablespoons fresh cilantro, chopped
2 cloves garlic, mashed
1 teaspoon chile powder
pinch salt and pepper
2 pounds boneless, skinless chicken breast halves, 6-8
Directions
Place all ingredients, except for the chicken, in a gallon-sized zip top plastic bag. Squish to combine. Add chicken, seal bag, and turn to coat. Refrigerate for one hour or overnight. Coat grill pan (or grill) with cooking spray. Heat pan (or grill) to medium-high. Cook chicken for 4-5 minutes on each side, turning breast a quarter turn after two minutes if cross hatch marks are desired. Serve immediately.