Sift (Or Whisk) flour, baking powder, baking soda, and salt in a medium bowl
In a large stovetop pan, melt butter and turn off heat.
Whisk in brown sugar, eggs, and vanilla.
Slowly whisk in dry ingredients and pour into a greased 9x13 pan
Top with semi sweet chocolate chips and bake for 20 minutes at 350 degrees
Remove from oven and let cool before slicing and serving.