In a large bowl, add all meatloaf ingredients and mix with your hands until combined. Do NOT overmix it! Divide the mixture between two 9 x 5-inch loaf pans and set aside.
For the glaze, in a medium bowl, stir together the sugar, ketchup, and mustard. Brush the top of each meatloaf with a thick coat of the glaze. Transfer to the oven and bake until an instant-read thermometer inserted in the middle registers 150 degrees F, about 45 minutes.
Let the meatloaves rest for 10 to 15 minutes, unmold, cut into slices, and serve.