Preheat the oven to 190°C/170°C fan/ 375°F/gas mark 5. Line 2 baking trays/sheets with baking paper.
Tip the flour and butter into a food processor and pulse until the mix resembles breadcrumbs. Add the Cheddar, mustard powder and rosemary. Season and again blitz until the mixture comes together. Tip onto a flour-dusted work surface and bring together with your hands to form a disc.
Roll the disc out until 5mm/1/5in thick. Use a 5cm/2in round cutter to stamp out the biscuits. Reroll the dough until you have 20 biscuits. Arrange on the baking trays and brush the tops with the beaten egg. Bake in the oven for 8-10 mins until lightly golden.
Cool completely on a wire rack and enjoy.
Sign up for our newsletter
Be the first to find out about competitions and prizes, new ranges and special editions, and all the news from Ivy’s dairy. Just enter your email address here.
