have made this many times with brownie mix and oil its outstanding hubby loves
I think you could use a brownie mix for the crust and it would be just as good and a lot faster to make. I have used the mix for similar recipes with good results.
Very rich. I thought i read the directions carefully but would up putting all the brownie mixture for the crust so I doubled the recipe for the part on the sides of the pan. Somewhat difficult to get the moist brownie mix to stay on the pan sides. Would suggest making it several days ahead of time as the peanut butter flavor is enhanced and the sour cream taste less intense. I needed to cook the cake 15 minutes longer than the stated time so the 'center set'. Very good though.