Place rack in center of oven then preheat to 400 degrees. Lightly coat a baking sheet with non-stick spray then set aside. Place chicken sausage into a large bowl, add onion, pepper jack and Parmesan cheeses. Sprinkle over salt pepper and cayenne. Mix together then set aside.
In a small bowl whisk 2 eggs. Mix into sausage and cheese then add almond flour. Stir only until no dry flour is visible. Over-mixing will make the meatballs heavy.
Using a 1 oz scoop, form 30 meatballs placing them on the prepared baking sheet. Bake 15-18 minutes until cooked through.
Transfer to a serving platter and garnish with chopped green onion.
Notes
Buy your pepper jack cheese in a thick slab from the deli section of your supermarket for the gooiest selection!