1. Preheat your oven to 400°F (200°C) if baking and prepare a surface for cooking.
2. In a medium bowl, combine ground beef and pork, mixing gently to combine.
3. Add Parmesan cheese, heavy cream, beaten egg, parsley, grated onion, garlic, salt, pepper, and any optional seasonings. Mix until just combined.
4. Oil your hands slightly to prevent sticking and form the mixture into 12 meatballs of equal size.
5. Choose your cooking method:
– Pan-fry on medium heat, turning frequently for 10–15 minutes until browned and cooked through.
– Bake for 15–20 minutes until fully cooked, or try a combined method by baking to set the shape then pan-frying.
– Use an air fryer at 400°F (200°C) for about 10 minutes.
6. Serve warm with low carb marinara sauce. Optional: top with mozzarella and broil until bubbly.