In a medium bowl, combine sour cream, chunky peanut butter, soy sauce, vinegar, sesame oil, chili powder, sugar, and crushed garlic clove; stir well.
Pound deboned turkey until flattened to 1-inch thick. Marinate in the peanut butter sauce overnight.
Grill over medium coals for 15 minutes on each side, baste frequently with the sauce.
Servings: 6