Preheat oven to 400 degrees.

Beat egg with a fork in a large bowl, then add the next 6 ingredients and combine gently.

If you have one, use a medium cookie scoop to scoop the mixture into 1.5 inch meatballs, and place each on a nonstick foil-lined sheet pan as you go. After you have them all arranged on the sheet pan, wet your hands with cold water and roll gently into balls. You may need to wet your hands a few times since the mixture can be sticky. When you are done, you should have between 20-25 meatballs.

Bake meatballs at 400 for 12-15 minutes. Use a meat thermometer to test that they are fully cooked—they should measure 165 degrees internally.

While meatballs are cooking, slice mozzarella into thin slices—one for each meatball.

When meatballs come out of the oven, top each with a spoonful of marinara sauce and a slice of cheese.

Then place the sheet pan on the top rack of the oven, about 5 inches from the heat source, and set the broiler to high.

Broil for 3-5 minutes, until cheese melts and begins to brown slightly.

Serve meatballs with garlic bread or pasta, spooning over additional marinara sauce that you have warmed up in a saucepan on the stove. A green salad is lovely on the side!