This was a meal I got from our freezer swap. I'm not positive that this is the recipe, but it seems like the same.
3 tablespoons or 1 pkg. ranch dressing mix
1 tbsp garlic salt
2 tbsp water
¼ C olive oil
1 tbsp lemon juice
Combine all ingredients in a small bowl and pour over 2-3 lbs boneless skinless chicken breasts in a gallon sized ziplock bag. At this point, I froze it. When we were ready to eat it, I defrosted it and grilled the chicken. The chicken was so moist!! All of my kids liked this until they realized it was ranch dressing...then two of them decided they didn't like it anymore.
You could just let it marinade in the refrigerator for 4-24 hours and then grill.