When I was younger my parents made this for a church youth group activity. They put the marinade right into the frozen chicken bags, let them sit for the day and then took the bags to the activity and grilled them there. This recipe can feed a huge crowd (just adjust the marinade to your amount) or for your family. But, seriously make some extra for the next day!
1 cup vegetable oil
1 cup soy sauce
1/4 tsp. garlic powder
1 tsp. horseradish sauce
2 cups 7-up
Chicken breasts or tenders - enough to fit comfortably in a gallon zip-lock bag
Mix all the ingredients together and marinade the chicken overnight. The longer the better! I usually put my zip-lock bag on a cookie sheet in the fridge and I try to remember to turn it over every so often. Grill and enjoy!