Remove the Italian sausage from its casing and crumble meat into a large mixing bowl.
Mix all of the ingredients on the list, from the Italian sausage until the avocado oil, together until well combined.
With lightly oiled hands, roll the meatballs into the desired size.
To cook, heat avocado oil in an oven-safe saute pan or cast-iron skillet over medium to medium-high heat. Once hot, add the meatballs. Fry 5-7 minutes, until bottom is browned.
Turn meatballs to opposite side and fry until that side is nicely browned, another 5-7 minutes.
When all meatballs are finished browning on both sides, remove from heat and turn off the stove.
Pour 1 jar of Primal Kitchen Roasted Garlic Marinara Sauce on top of the meatballs. Bake meatballs and sauce in the oven, uncovered, for 15 minutes.
Meanwhile, heat 1 tablespoon of avocado oil in a large saucepan over medium-high heat. Saute the zoodles until tender, about 6–8 minutes.
Drain the zoodles well in a fine-mesh sieve or colander with small holes. Pat drained zoodles dry with a clean kitchen towel.
When the meatballs and sauce have finished baking for 15 minutes, remove from oven. Sprinkle with fresh chopped parsley, if desired.
Serve the meatballs and sauce with the zoodles. Mangia!