1- Sift together the flour, baking powder, salt, cocoa powder, and espresso powder in a large bowl, then set it aside for later.

2- In a medium saucepan, combine the butter, oil, and one-third cup of the sugar; heat over medium, stirring often, until the butter melts, then remove from heat.

3- In another large bowl, whisk the eggs, egg yolk, vanilla extract, and the remaining sugar until everything blends well.

4- Slowly mix the warm butter mixture into the egg mix a bit at a time, whisking constantly to combine fully.

5- Fold in the dry ingredients and chocolate chips gently, just until mixed, to keep your brownies fudgy and not cakey.

6- Pour the batter into your prepared pan, smooth the top, and bake for 28 to 30 minutes until the edges firm up and the top looks shiny with cracks.

7- Let the brownies cool completely on a wire rack before slicing, which takes about 2 hours, for the best texture in your cocoa fudge brownies recipe.