Preheat oven to 375 degrees. Line a baking sheet with parchment paper or a silicon baking mat.
Combine the Chebe Focaccia Mix with 2 tablespoons olive oil, 2 eggs, 1 cup Parmesan cheese, and ¼ cup water. Stir to combine. Dump the mixture onto a clean work surface and knead until smooth. Divide into 4 equal sized pieces. Roll each portion into a ball, place on the prepared baking sheet and flatten into disks about 4 inches across. Brush the tops with olive oil and bake for 20 minutes or until the buns are browned and cooked through.
While the buns are baking, make the chicken burgers.
Heat the marinara sauce and keep warm.
Combine the remaining 1/3 cup Parmesan with the breadcrumbs and place on a plate.
Combine the chicken with the garlic, onion, 1 teaspoon salt, ½ teaspoon pepper, and the oregano. Divide into 4 equal sized patties. Coat the burger patties with the breadcrumb/cheese mixture, pressing the crumbs lightly into the burger.
Heat 2 tablespoons olive oil in a large skillet with a lid over medium heat. Fry the burgers in the hot oil until browned and crispy on the bottom, about 4 minutes. Flip, top with the mozzarella cheese slices, cover the pan and cook until the bottom is crispy, the burger cooked through and the cheese melted, 3 – 4 minutes.
Cut the Parmesan buns in half, place a good handful of arugula on the bottom half, top with a chicken burger, spoon on some sauce and place the top of the bun on top. Serve immediately.