In a mixing bowl, combine flour and sugar. Add cold butter and mix until crumbly.

Add egg yolk and cold water, mixing until the dough forms. Wrap in plastic and refrigerate for 30 minutes.

Preheat the oven to 350°F (175°C). Roll out the dough and cut into circles to fit the tartlet pan.

Press the dough into the tartlet pan and prick the bottoms with a fork. Bake for 15 minutes or until golden.

For sweet tarts, mix cream cheese, powdered sugar, and vanilla extract until smooth.

For savory tarts, mix cheese and herbs together.

Fill the baked tart shells with your desired filling.

Top with fresh fruit for sweet tarts or additional herbs for savory tarts.