Place 4 boneless skinless chicken breasts in a zip-top plastic bag.
Combine 1 cup balsamic vinaigrette salad dressing, 3 cloves minced garlic and 1/4 teaspoon crushed red pepper and pour over chicken.
Seal bag and refrigerate for 1-4 hours (the longer, the better).
Preheat oven to 400 degrees, or grill to medium high heat.
Remove chicken from bag and place in a baking dish.
Pour remaining marinade over chicken. Season with salt and pepper.
Bake for 20-30 minutes, or until juices run clear and chicken reaches and internal temperature of 165°F (73.9 °C) on an instant read thermometer. Alternately, grill chicken over medium heat for 5-7 minutes per side.