1. Preheat oven to 400°.
2. Find lengthwise seam in dough. Beginning at seam, gently unroll dough into a rectangle on a lightly floured surface. Cut the dough crosswise into 2 equal portions. Roll each portion into a 15 x 6-inch rectangle on a lightly floured surface. Place each rectangle on a baking sheet sprinkled with 1 teaspoon cornmeal.
3. Heat a nonstick skillet over medium heat. Add onion and turkey Italian sausage to pan; cook 4 minutes or until lightly browned, stirring to crumble. Divide sausage mixture evenly between rectangles, spreading evenly down length of dough, leaving a 1/4-inch border on each; top each rectangle evenly with 1/4 cup cheese. Bake at 400° for 10 minutes or until lightly browned. Remove from oven. Break 3 eggs onto each flatbread, spacing evenly lengthwise; sprinkle evenly with salt and freshly ground black pepper. Bake an additional 5 minutes or until eggs are set. Turn oven off; leave flatbreads in oven with oven door closed for 4 minutes or until desired degree of doneness. Remove from oven.
4. Combine arugula, fresh lemon juice, and extra-virgin olive oil; toss. Arrange arugula mixture evenly over flatbreads. Cut each flatbread crosswise into 3 squares; serve immediately.