Sift the flour and baking powder into a bowl.

Beat in the butter using an electric mixer until fluffy and light.

Mix in both types of sugar and then the vanilla and egg, and beat for 2 minutes more.

Fold in the chocolate chips as well as about ¾ of the M&M candies.

Line a baking sheet with parchment paper.

Use a medium scoop to drop spoonfuls of dough on there, leaving 2 inches between each one.

Freeze the baking tray with the cookie dough on for half an hour.

Preheat the oven to 350°F and take the baking tray out of the freezer.

Bake for 15 minutes or until golden at the edges.

Take out of the oven and add the remaining M&Ms on top, pressing them in gently.

Let them cool on the baking tray for 10 minutes, then transfer them on to a wire rack to finish cooling.