Chocolate Chip Cookie Dough Brownies

Prepare brownie recipe, adding 1/2t baking powder to dry ingredients, and pour into prepared 9X13 pan.
Bake per directions but removing from oven with about 5 minutes remaining on time…so, slightly underdone, but firm on top and sides
Meanwhile, cream butter with sugars
Add vanilla and sour cream and beat until light
Add remaining dry ingredients and stir til combined.
You may need to add a touch more flour. You want dough to be thick enough to pick up and manipulate to flatten in your hands, but not as thick as rolled cookie dough.
Spread* cookie dough over warm brownies, spreading to the edge.
Sprinkle with chips and return to oven for about 10 more minutes til cookie dough edges are browning and chips are melting.
Cool COMPLETELY before cutting.

*I do this by picking up about 1/4 of the dough and flattening it between my two palms and laying it over a portion of the brownies in the pan. Then, just do the same with the rest until covered. You can carefully use your fingers to seal any edges or breaks in the dough to look similar to a top pie crust.