Preheat the oven to 375° F. Line a baking sheet with parchment paper and place an oven-safe rack on the baking sheet.
In a large bowl, combine the ground beef, parmesan, almond flour, onion, garlic, oregano, salt, and pepper.
Beat the eggs and sprinkle with the gelatin. Allow to sit for 5 minutes and then whisk to combine.
Pour the gelatin mixture over the meat mixture and mix gently with your hands.
Use a small cookie scoop to form into meatballs.
Use your finger, make a hole in each meatball and insert 1 mozzarella cube. Seal around the mozzarella and arrange it on the baking sheet. Brush with oil.
Bake for about 25 to 30 minutes, until an instant-read thermometer reaches 160° F.
Stir the meatballs into warm marinara and serve over cabbage noodles, zucchini noodles, or palimi noodles.