Prepare brownies according to instructions. Bake in preheated oven for 25-30 minutes. Brownies should not be completely done.
While brownies are baking, prepare pecan pie topping. Cream brown sugar and butter using a hand or stand mixer. Add rest of ingredients one at a time until all are incorporated.
When brownies have baked for 25-30 minutes, remove from oven and pour pecan mixture over the top and gently spread or work to the edges. It's ok if a little of the brownie batter rises to the top in the center.
Bake brownies with pecan pie topping for another 40 minutes or until the center is almost set or barely jiggles. Cool before cutting.
