Preheat your oven to 400 degrees Fahrenheit and line a baking sheet with parchment paper.
In a medium bowl, combine the ground chicken, egg, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper until well incorporated.
Transfer the chicken mixture to the prepared baking sheet and pat it down into a rectangular shape about one-quarter inch thick.
Bake for 15 to 20 minutes until the edges are golden brown and the base is firm to the touch.
Remove from the oven and sprinkle the shredded mozzarella cheese evenly over the top of the chicken crust.
Place the baking sheet back in the oven under the broiler for 2 to 3 minutes until the cheese is melted and bubbly.
While the cheese melts, warm the marinara sauce in a small saucepan or microwave-safe bowl.
Allow the breadsticks to cool for a few minutes before slicing them into thin strips.
Serve the warm breadsticks immediately with the marinara sauce on the side for dipping.