Preheat the oven to 180ºC (350ºF/Gas 4). Line two flat baking trays with greese proof paper.
Use an electric mixer (white mixing paddle for stiff doughs), beat the softened butter and sugars in the mixing bowl until pale and creamy. Add the egg and egg yolk and beat until well combined.
Add the sifted flour, baking powder and chocolate buttons and stir until well combined.
Roll 1 standard tablespoon of mixture into a round ball - flatten slightly and place on lined trays. Repeat with remaining dough. Bake in preheated oven for 12 minutes for a perfectly gooey and chewy biscuit. Remove from oven and set aside to cool or consume straight away - warm and delicious!
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