Mix all ingredients together, then cover and allow to rest for 30 minutes. (See notes. This is a recipe update.)
After 15 minutes, preheat the oven to 400°F (350°F if convection baking) with the rack at the middle position.
Spray a large sheet pan and a rack with cooking spray. Form the mixture into balls about 1 inch in diameter and place on the rack. Lightly spray all the meatballs with cooking spray.
Bake for 15 to 20 minutes, until done.
To brown the meatballs, if desired, place the pan of meatballs approximately 4" from the broiler element and set the oven controls on "Broil". Watch closely for your desired amount of browning (1 to 2 minutes), and remove from oven.
Serve as desired.