Combine topping ingredients and set aside.
In a large bowl, mix together the meatloaf ingredients. Place mixture into a 9 x 9 aluminum tray and form into an evenly shaped loaf.
Preheat pellet grill to 300 degrees F.
Slather meatloaf with topping and place into the pellet grill.
Cook for one and a half hours until the meatloaf reaches an internal temperature of 165 degrees F.
Remove, and let the meatloaf rest for about 7-10 minutes. Slice and serve.