In a small bowl, combine together breadcrumbs and whole milk. Allow to rest for 10 minutes so the breadcrumbs fully soak the milk.
Now in a large bowl, add the ground beef along with the garlic, egg, parsley, parmesan, salt, Italian seasoning, paprika, black pepper, onion powder, and the soaked breadcrumbs.
Combine everything together so all the ingredients are evenly throughout.
Shape into meatballs (desired size) using greased hands to prevent sticking.
If stuffing with cheese, add small piece of mozzarella to the center of the meatball and wrap tightly around making sure it’s sealed well.
Heat a large skillet or pan over medium-high heat.
Add 2 to 3 tablespoons of olive oil to the pan.
Drop the meatballs in, spacing them apart. Allow the bottom to brown (about 5 minutes), then flip over. Once the other side is browned too, drop the heat to low and allow to cook through. If you are serving in marinara sauce, add the meatballs to the sauce when you drop the heat to low, cover, and simmer for about 15 minutes or until the meatballs are 165 degrees in the center.
Serve and enjoy!