In a bowl, mix sausage with beef, salt, pepper, almond flour, parsley, pepper flakes, onion powder, garlic powder, oregano, parmesan and eggs and stir well.
Shape meatballs, place them on a lined baking sheet, introduce in the oven at 375 degrees F and bake for 15 minutes.
Take meatballs out of the oven, transfer them to a baking dish and cover with half of the marinara sauce.
Add ricotta cheese all over, then pour the rest of the marinara sauce.
Sprinkle mozzarella all over, introduce dish in the oven at 375 degrees F and bake for 30 minutes.
Leave your meatballs casserole to cool down a bit before cutting and serving.