In a large mixing bowl, add turkey, sausage, chopped onion, garlic, bread crumbs (or almond flour), basil, parsley, whisked egg, salt, and pepper.
Mix the meatball mixture together by hand until just combined, taking care to not over mix.
Make 15 meatballs approximately 1½ inches in size.
In a skillet on medium heat, add the olive oil. Once heated, add meatballs. Keep an eye on them to prevent them from sticking to the skillet.
Cook 3-4 minutes on each side until golden brown. Remove from skillet.
In the now empty skillet, add in ½ cup chicken broth and deglaze the plan.
Add the meatballs and marinara sauce, stirring slowly so as to maintain the meatballs' shape.
Cover and let cook for 15-20 minutes until meatballs are cooked through to a temperature of 160 degrees fahrenheit.