For the meatballs:
Combine all of the meatball ingredients in a medium bowl and mix thoroughly.
Form into approximately thirty two 1.5″ meatballs.
Place the meatballs on a parchment lined baking sheet, and bake at 375 degrees (F) for 15 minutes.
For the casserole:
Place the meatballs in a casserole dish (13×9 should do) in a single layer.
Pour half of the keto marinara sauce over the meatballs.
Drop the ricotta cheese by generous teaspoonfuls evenly over the casserole.
Pour the second half of the marinara sauce over the top.
Sprinkle the mozzarella cheese over the entire thing.
Bake for about 30 minutes at 375 degrees (F).