Add turkey, breadcrumbs, egg whites, salt and pepper to a large bowl. Mix together and form into 4 patties.
Grill patties over medium heat until they reach an internal temperature of 180 degrees F (85 degrees C).
Melt butter in a saucepan, add apples and sauté for a couple of minutes. Add honey and sage and continue sautéing until apples are soft.
Assemble 4 plates, placing 2 lettuce leaves on each plate. Add turkey burger and top with brie slices, apples and red onion rings. Drizzle balsamic glaze over the top and enjoy!