Preheat oven to 350 degrees F. Line a couple of cookie sheets with parchment.Sift or thoroughly whisk together flour, baking powder, baking soda and salt. Set aside.Cream butter and both sugars with an electric mixer;
Add egg and vanilla and beat until egg is mixed in.
Add flour mixture and stir until incorporated. Stir in chocolate chips.Drop by rounded teaspoons onto the parchment lined cookie sheets and bake for 12-15 minutes (or longer) or until the edges start to brown. The baking powder prevents the cookies from browning quickly, so it seems the cookies can bake a longer time and becoming crunchier without burning or getting overly brown. I baked mine on an insulated cookie sheet, so if you notice your bottoms are browning too fast, switch to an insulated cookie sheet or stack you cookie sheet on top of another one to make your own insulated sheet.
