Preheat the oven to 400°F (200°C). Roll out the puff pastry on a lightly floured surface and cut into circles to fit a muffin tin.
Press the pastry circles into each cup of the muffin tin and set aside.
In a saucepan, combine the cream, milk, sugar, and flour. Stir over medium heat until the mixture thickens, then remove from heat.
Whisk together the egg yolks and vanilla extract in a separate bowl.
Slowly add the egg mixture to the saucepan, stirring continuously to prevent curdling.
Pour the custard into each pastry cup, filling nearly to the top.
Bake for 20 minutes or until the tops are golden brown and slightly blistered.
Remove from the oven and allow to cool slightly. Serve warm, dusted with cinnamon.