01 -
Combine vinegar, herbs, mustard, garlic powder (if using), and olive oil in a large resealable plastic bag. Seal and shake vigorously to blend all ingredients thoroughly.
02 -
Add chicken breasts to the marinade bag, seal tightly, and shake to coat evenly. Refrigerate for at least 8 hours or freeze for up to 2 weeks.
03 -
If frozen, thaw overnight in refrigerator, under cold running water, or in microwave at 30% power for 1-minute intervals.
04 -
Heat grill or grill pan to medium-high heat. Grill chicken 4 minutes per side until internal temperature reaches 165°F. Alternatively, bake at 375°F for 15 minutes until cooked through.