How to Make It
Preheat oven to 475°F. Using your hands, combine beef, sausage, kale, cheese, garlic, salt, pepper, and eggs until incorporated. Form mixture into 40 (1 1/2-inch) balls. Place meatballs in a 13- x 9-inch baking dish coated with cooking spray.
Bake in preheated oven until golden brown and cooked through, about 10 minutes. Spoon marinara onto a serving platter; place meatballs on top, and serve with toothpicks or tiny forks.