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Heat olive oil in a small skillet over medium heat. Add onions and cook for 5 minutes. Add garlic and cook for 1 more minute. Set aside and let cool.
Crack an egg in a small bowl and whisk it. Add the milk and whisk to combine.
Combine the dry mixture with the wet mixture to form a smooth paste. Mix in the onions and garlic. (This is called a panade and keeps the juiciness and flavor intact while the meatballs cook.)
Roll into 1 ½ inch meatballs.
Pour ¾ of the marinara sauce on the bottom of a 9×13 inch casserole dish. Add the meatballs. Spoon remaining sauce over the top.
Uncover and top with cheese. Bake 15 more minutes. Broil for additional 1-2 minutes at the end if desired. Sprinkle with parsley and serve.
To save time, you can skip sautéing the onions and garlic. Doing so creates a more subtle texture and flavor, particularly for picky eaters.
The internal temperature of meatballs should be 160 degrees before serving.
Make Ahead Method
You can also flash freeze the raw meatballs on a baking sheet for 1.5 hours, then store them in a gallon freezer bag for up to 3 months. Let them defrost in the fridge overnight prior to baking.
Crock Pot Method
Storage
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