Preheat your oven to 400 degrees F (200 degrees C). Line a large baking sheet with parchment paper.
In a large bowl, combine the ground beef, almond flour, Parmesan cheese, egg, minced garlic, garlic powder, onion powder, Italian seasoning, salt, and pepper. Mix gently with your hands until just combined. Do not overwork the meat.
Roll the mixture into 1.5-inch meatballs (about golf ball size). You should get approximately 20 meatballs. Place them on the prepared baking sheet with a little space between each one.
Bake for 20 to 25 minutes, until the meatballs are golden brown on the outside and cooked through (internal temperature of 165 degrees F / 74 degrees C).
While the meatballs bake, warm the marinara sauce in a large skillet over medium heat.
Add the baked meatballs to the skillet and gently toss to coat. Simmer for 5 minutes so the meatballs absorb the sauce.
Serve topped with fresh parsley and extra Parmesan cheese. Enjoy over zucchini noodles, in lettuce wraps, or on their own.