Preheat the oven to 350°F (175°C).
In a mixing bowl, combine the flour, sugar, and butter until crumbly.
Add the egg and vanilla extract to the mixture; blend until incorporated.
Press the mixture into the bottom of a greased square baking dish.
Bake the crust for 20–25 minutes, or until lightly golden.
While the crust is baking, prepare the filling by mixing ricotta, powdered sugar, cinnamon, orange zest, and optional chocolate chips.
Once the crust has cooled, spread the ricotta mixture evenly over the top.
Refrigerate the assembled squares for at least 2 hours before serving.
Cut into squares and serve, garnishing with additional powdered sugar, if desired.