My changes: I modified the recipe by using only lean ground turkey. I left out the goat cheese and breadcrumbs (because I'm on a gluten-free, dairy-free diet). But, breadcrumbs definitely make meatballs moist.
Mom's SECRET Recipe: Grilled Chicken ~~ cup soy sauce tsp Horseradish (it tastes okay without this, but I highly recommend using it! Adds the perfect amount of zip!) 1 oz) can of lemon-lime soda pop (not diet) cup vegetable oil ~~ Mix--Marinate--Grill!