How To Make Croissants

Step 1: You will need:
500 g flour 15 g active dry yeast 90 g sugar 15 g salt 300 ml warm milk 340 g butter , room temperature 1 egg , beaten with 2 Tbsp water some extra flour 1 rolling pin cling film 1 knife 1 baking tray lined with parchment 1 mixer with hook attachment 1 bowl 1 tea towel 1 plastic bag 1 brush