Preheat your oven to 350 degrees. Spray a 9 by 13 inch glass baking dish with cooking spray and set aside.
In a large bowl mix together 2 1/2 cups all purpose flour, 2 TBSPs cocoa powder, 1/2 tsp baking powder, and 1/2 tsp salt.
Cream together the 14 TBSPs (1 3/4 sticks) butter and 1 1/2 cups sugar until light and fluffy. Add in the eggs, one at a time, then 2 tsps vanilla, 1 tsp white vinegar, and 1 TBSP green food coloring.
Slowly add in the flour mixture a little bit at a time until the dough is fully combined.
The dough will be very sticky. Press it into the bottom of the baking dish and bake for 20 to 22 minutes.
Remove from the oven and allow it to cool completely.
Meanwhile, mix together the butter and cream cheese until fully combined. Add the vanilla extract. Slowly mix in the powdered sugar until fully combined. Spread over the cooled bars and top with golden sprinkles