Preheat grill to MEDIUM-HIGH.
In a large bowl, thoroughly combine first 5 ingredients (ground turkey through salt and pepper); form mixture into 4 to 6 round patties.
Place turkey burgers on preheated grill; cook for 5 minutes per side or until no longer pink in the center.
In a medium bowl, combine next 6 ingredients (green onions through chili powder); season with salt and pepper to taste.
To serve: Layer a lettuce leaf, a turkey burger, and a spoonful of coconut cream sauce; top with a second lettuce leaf.