1 1/4 cups plain flour
1/3 cups unsweetened cocoa powder
1/2 tsp bicarb soda
2/3 cup brown sugar (packed)
1/4 cup sugar
1/4 tsp salt
1 tsp vanilla
140g chocolate chips
Preheat oven to 160 degrees C. Place non-stick baking paper onto 2 large trays.
Beat butter till creamy in an electric mixer. Add sugars, salt and vanilla and beat for another 2 minutes. Mix in the dry ingredients and chocolate chips by hand.
Work the dough by hand until it sticks together, then make two logs about 4cm in diameter. Wrap in plastic and chill for at least 1/2 hour.
With your sharpest knife cut the logs into rounds (l like them quite thin - about 5mm thick, but you can make them thicker). The sharp knife is essential otherwise the chocolate chips make the log fall apart.
Place on tray and bake for 12 minutes, they will firm as they cool. Allow to cool on the tray.