In a large bowl, whisk together flour, sugar, and salt. Cut in butter until mixture resembles coarse crumbs. Gradually add ice water, mixing until dough comes together.
Form dough into a disc, wrap in plastic wrap, and refrigerate for at least 30 minutes.
Preheat oven to 375°F (190°C). Roll out dough thinly and cut into small circles. Press each circle into a mini muffin tin.
Bake for 12-15 minutes, or until golden brown. Let cool completely in the muffin tin before removing.
In a separate bowl, combine ricotta cheese, powdered sugar, and vanilla extract. Mix until smooth and creamy.
Pipe or spoon ricotta mixture into cooled cannoli cups. Garnish with mini chocolate chips.
Serve immediately or refrigerate for later.
Notes
For extra flavor, add a pinch of cinnamon to the dough or a splash of orange liqueur to the ricotta filling.