01 -
Heat your oven to 400°F so it's nice and hot when you're ready to bake.
02 -
Grab a big mixing bowl and combine the ground chicken with the egg, almond flour, Parmesan, minced garlic, onion powder, salt, and pepper. Use your hands to mix everything together until well combined, then shape the mixture into 12 evenly-sized meatballs.
03 -
Spread about 1 cup of marinara sauce across the bottom of your baking dish or cast iron skillet - this creates a flavorful base for the meatballs.
04 -
Nestle the meatballs into the sauce in your dish. Spoon the remaining marinara over each meatball, making sure they're nicely coated. Finish by sprinkling both the mozzarella and Parmesan cheese generously over the top.
05 -
Pop the dish into your preheated oven and bake for 25 to 30 minutes. You'll know they're done when the cheese is bubbly and golden, and the internal temperature reaches 165°F. Let them cool for a few minutes, then dig in!