Preheat oven to 400°F and line a baking sheet with parchment paper.
In a large bowl, combine ground chicken, egg, almond flour, parmesan, garlic powder, onion powder, salt, and pepper.
Mix gently by hand until just combined, being careful not to overwork the meat.
Scoop and roll the mixture into 1.5-inch balls and place them on the prepared baking sheet.
Bake for 15-18 minutes until the meatballs are cooked through and slightly golden on the outside.
While meatballs bake, warm the marinara sauce in a skillet over medium-low heat.
Steam the broccoli florets until tender-crisp.
Toss the cooked meatballs into the warm sauce and serve alongside the steamed broccoli.