In a separate bowl, mix together the ricotta and parmesan cheeses.
Season with salt and freshly ground pepper. Set aside.
Cut even-sized rectangles out of the dough. Place 1 teaspoon of the ricotta filling a half-inch apart along one dough rectangle.
Brush the other side with water and place on top of the piece with the filling. Gently press it down around the filling part with your fingers merging the top and bottom parts around the filling.