Preheat the oven to 170°C (340°F) and grease a 9-inch springform pan.
In a large mixing bowl, beat the ricotta cheese until smooth and creamy.
Add the sugar and mix until fully combined.
Beat in the eggs one at a time, mixing well after each addition.
Stir in the orange zest and vanilla extract.
Gently fold in the flour until the batter is smooth.
Pour the mixture into the prepared pan and smooth the top.
Bake for 50–60 minutes or until the center is set and lightly golden.
Let the cheesecake cool completely at room temperature.
Refrigerate for at least 4 hours before serving.
Garnish with fresh orange slices or a light dusting of powdered sugar if desired.