Make the brownie batter first. Add melted butter and 1 cup dark chocolate chips to a bowl. Stir until creamy and fully melted. If needed, microwave for 10 to 15 seconds. Set aside.

In a mixing bowl, add eggs and coconut sugar. Whisk vigorously for 2 to 3 minutes, until light and frothy.

Add the melted chocolate mixture to the mixing bowl. Stir to combine.

Then, add in dark cocoa powder, vanilla, flour and espresso powder. Stir to combine.

Fold in extra chocolate chips if desired.

Then, make the banana bread batter. Add all of the banana bread ingredients to a bowl. Stir to combine.

Then, use two cookie scoops to scoop alternating dough into the pan. Scoop the brownie batter, followed by a scoop of the banana bread batter, and so on.

Bake for 35 to 38 minutes, or until a toothpick inserted comes out with only a few moist crumbs.

Finally, remove from the oven. Allow to cool fully before slicing and serving.