Preheat the oven to 180°C/160°fan/350°F/gas 4 and grease 3 baking sheets with a little oil.
Mix the flour, baking powder and salt in a bowl and set to one side. In a large bowl, whisk the eggs and sugar together until pale and fluffy. Add the Activia 0% Vanilla yogurt and mix thoroughly. Gradually beat in the flour to form the cookie dough.
Fold in the chocolate chips and spoon onto the prepared baking sheets using a heaped dessertspoon for each cookie. Bake for 9-11 minutes until the tops are golden brown. Cool on a wire rack.