Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Pat the chicken sausages dry with a paper towel and insert a wooden skewer into the end of each link.
In a medium mixing bowl, whisk together the cornmeal, oat flour, baking powder, sea salt, and garlic powder.
Stir in the Greek yogurt and egg white until a thick, uniform batter forms that is sticky enough to cling to the sausage.
Transfer the batter to a tall, narrow glass to make dipping easier.
Dip each sausage into the batter, rotating it slowly to ensure an even, thick coating all the way to the skewer base.
Place the coated sausages on the prepared baking sheet and lightly spray the surface with avocado oil.
Bake for 15 to 18 minutes, turning once halfway through, until the crust is firm and lightly browned.
Serve the corn dogs immediately with a side of yellow mustard for dipping.