Place the chicken on a cutting board or work surface, cover with a sheet of plastic wrap or wax paper. Pound the chicken breasts out to a uniform 1/2 inch thickness using the flat side of a meat mallet.
In a small bowl, whisk together the dry Ranch mix with fresh garlic, lemon juice, water and vegetable oil. Combine the marinade and chicken in a bowl or airtight plastic bag. Chill and marinate for as little as 30 minutes, but to 24 hours.
Before heating of the grill, allow the chicken to sit at room temperature for 10-20 minutes.
Heat the grill to medium-high heat (350°F). Spray with grill approved cooking spray and place chicken on indirect heat.. Cook for 5-7 minutes on each side, or until done. Since the sizes of chicken varies greatly, so will the cooking times. Use a meat thermometer to check doneness.
Remove and allow the chicken to rest for 5 minutes before serving.
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Notes
Chicken can also be baked at 350 degrees for approximately 15-20 minutes or until fully cooked.