Preheat your oven to 200°C (180°Fan, gas mark 6) and grease a holed mince pin tin (or cupcake tin) with butter.
Unroll the puff pastry sheet and cut out 12 bases using a 7.4cm or 7.5cm fluted cookie cutter. Place the bases into your holed mince pie tin and gently press them down.
2 Ready Rolled Puff Pastry Sheets
Spoon one teaspoon of mincemeat into the middle of the pastry bases. Gently brush whisked egg around the edges.
12 tsp Mincemeat, 1 Egg
Unroll the remaining puff pastry sheet and cut out 12 lids using a smaller 6cm to 6.8cm fluted cookie cutter.
2 Ready Rolled Puff Pastry Sheets
Place the lids on top of the mincemeat and gently press them into the sides of the base. If you're using a star or snowflake cutter, carefully place the lids in the centre of the mincemeat.
Lightly brush egg over the pastry and sprinkle with sugar.
3 tsp Demerara Sugar, 1 Egg
Bake in the oven for 10 to 15 minutes or until puffed up and golden brown.