To prepare a triple treat squares cookie recipe, first you need to gather your ingredients. First, you'll need your flour, baking powder, sugar, salt, and cocoa powder. Then, add your dry ingredients to the wet ingredients and mix until everything is well combined. Next, preheat the oven to 350 degrees F (180 degrees C) and prepare your cookie sheet. Line the bottom of the baking sheet with parchment paper and set aside. In the bowl of an electric mixer, cream together the butter and sugar until light and fluffy. Add the egg and vanilla and beat on medium speed until the mixture reaches stiff peaks. Fold in the chocolate chips. Scoop the cookie dough into the greased and floured cookie sheets. Bake the cookies for 12 to 15 minutes, or until they're golden brown. Allow to cool before removing from the pan.