Preheat the oven to 375 degrees. Line a baking sheet with aluminum foil and place a baking rack on top of the foil. Spray the rack with nonstick spray.
In a medium bowl, mix together ground beef, Panko, onion, eggs, ketchup, and 1/8 cup brown sugar until blended.
Form into about 1 inch balls and place on a prepared baking rack.
Bake for about 20 minutes, turning halfway through cooking time. Remove from oven and set aside