Preheat the oven to 300° F

In a separate bowl, sift together the flour, baking powder, baking soda, salt and set aside

Place the butter, brown sugar, and granulated sugar in the work bowl of an electric mixer fitted with a paddle attachment.

Beat on medium speed for about 30 seconds, until the mixture is fluffy.

Beat in the egg and vanilla for 30 seconds longer, until well combined.

Add dry ingredients to the mixer, while beating on slow speed for 15 seconds. Don't overmix

Stir in the chocolate chips so as not to crush them

Prepare a cookie sheet with about 2 tablespoons of shortening (or use a non-stick spray).

Using a 1-ounce scoop, or using a 2 tablespoon measure, drop the cookie dough onto the cookie sheet in dollops about 3 inches apart

Gently press down on the dough with the back of a spoon to spread out into 2-inch circles; there should be room on the sheet of six or eight cookies at a time

Transfer to the oven in batches and bake for about 15-20 minutes. Be careful not to overcook. The bottom will brown, but not the top, and they will firm up as they cool