Unroll dough onto cookie sheet. Starting at center, press out dough to 15x10-inch rectangle. Cut into six (5-inch) squares. Spread 2 teaspoons ricotta cheese onto half of each square to within 1/2 inch of edges; top each with 2 tablespoons diced cheese sticks and 1 tablespoon marinara sauce. Fold dough in half over filling; press edges firmly with fork to seal.