Preheat your oven to 400°F and line a baking sheet with parchment paper, lightly greasing it with avocado oil.
Pat the chicken sausages dry with a paper towel and insert a wooden skewer into the center of each sausage link.
In a tall glass or narrow jar, whisk together the egg and water until the mixture is well combined and slightly frothy.
Stir in the cornmeal, baking powder, garlic powder, salt, and pepper until a thick, smooth batter forms.
Dip each skewered sausage into the glass, rotating it to ensure the batter coats the entire surface evenly.
Carefully place the coated sausages on the baking sheet, ensuring they do not touch each other.
Bake for 15 to 18 minutes, turning the corn dogs halfway through, until the coating is firm and golden brown.
Serve the hot corn dogs immediately with a side of yellow mustard for dipping.