Preheat oven to 350 degrees (F) (175 degreed C). Line an 9×9-inch baking pan with parchment paper. Spray lightly with non-stick baking spray and set aside.
In a large bowl, sift together the flour, baking powder, salt, cocoa powder, and espresso powder. Set aside until needed.
In a medium saucepan, combine the butter, oil, and 1/3 cup of the sugar. Heat over medium heat, stirring frequently, until butter is completely melted. Remove from heat.
In a large mixing bowl, combine the eggs, egg yolk, vanilla (if using) and remaining sugar. Whisk until well combined, about 30 seconds.
Slowly, pour the warm butter mixture into the egg mixture, adding it very gradually (a little bit at a time) and whisking constantly until completely combined.

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