Pre-heat your oven to 190°c (170°c for fan-assisted ovens, Gas Mark 5 or 375°F) and grease a 12-hole tart/cupcake tray with a little excess butter/margarine.
First prep your mince meat - mincemeat straight from the jar is fine but adding some apple and cranberries gives your mince pies a little more flavour. Peel, core and chop your apple into 1cm cubes and mix into the mincemeat. Add a handful of cranberries also. Set aside.
In a large bowl, cream the butter/margarine and sugar for the pastry. Mix until combined before adding the flour and mixing to form a dough (you may need to use your hands). Wrap the dough in cling film and place in the fridge to chill while you prepare your crumble topping.
In a small bowl, add the flour, sugar and butter/margarine. Using your finger tips, mix the ingredients together until you have a breadcrumb-like mixture. Add the orange zest and stir through. Set aside.
On a floured work surface, roll out the dough to about 0.5cm, and cut into circles with a cookie cutter that is large enough to line each hole in your tray. Gently place into your prepared tray, pressing the pastry into place.
Fill each pastry casing with mincemeat - enough to fill generously but not come over the top edge of your pastry casing. Top the mincemeat with the crumble topping, ensuring the mincemeat is completely covered.
Bake in your pre-heated oven for 20-30 minutes until a light golden colour on top. Allow to cool in tray for approx 15 minutes before transferring to a wire rack to cool completely.
Dust with a little icing sugar (powdered sugar) before serving.