Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
In a medium mixing bowl, combine the self-rising flour, Greek yogurt, egg white, garlic powder, and sea salt until a shaggy dough forms.
Transfer the dough to a lightly floured surface and knead it gently for 1 to 2 minutes until the texture is smooth and elastic.
Roll or pat the dough into a rectangle approximately 1/2-inch thick and use a knife or pizza cutter to slice it into 6 even strips.
Arrange the strips on the prepared baking sheet, leaving space between each breadstick.
In a small dish, combine the olive oil and minced garlic, then brush the mixture evenly over the tops of the dough strips.
Sprinkle the shredded mozzarella, parmesan, and dried oregano over the breadsticks.
Bake for 12 to 15 minutes or until the cheese is melted and the edges of the breadsticks are a deep golden brown.
While the breadsticks bake, gently warm the marinara sauce in a small saucepan or microwave-safe bowl.
Serve the hot breadsticks immediately with the warm marinara sauce for dipping.