Cheesecake topping:
8 ounces reduced-fat cream cheese
1/3 cup sugar
1/2 teaspoon vanilla extract
1 large egg

Brownie Layer:
2 ounces semisweet chocolate, coarsely chopped
3 tablespoons unsalted butter
2 tablespoons canola oil
1 cup all-purpose flour
1/2 cup unsweetened Dutch-process cocoa powder
1 teaspoon baking powder
1/2 teaspoon fine sea salt
Pinch cayenne pepper
3/4 cup packed dark brown sugar
1/4 cup granulated sugar
1/2 cup lowfat buttermilk
2 large egg whites
2 teaspoons vanilla extract