Preheat oven to 350 degrees F and spray an 8x8 baking pan with cooking spray, then line with a parchment paper sling.

In a large bowl, mix together flour, cocoa powder, salt, sugar, eggs, butter, and vanilla until *just* combined.

Stir in chocolate chunks, then set aside.

In a large bowl, whisk together melted butter, granulated sugar, brown sugar, buttermilk, vanilla, and egg until well combined.

Stir in mashed bananas.

Fold in flour, baking soda, cinnamon and salt until *just* combined. Don’t over mix!

Pour half the banana batter into the prepared pan, then use a cookie scoop to scoop half the brownie batter on top.

Gently swirl the batters together with a knife.

Repeat with the remaining batters.

Bake in preheated oven for 40 minutes.

Cover with tin foil and cook for an additional 15-20 minutes. The center may still be a little gooey, but the top should be golden brown and the outside edges should be set - an inserted toothpick will come out mostly clean.

Lift the bars out of the pan immediately.

Cool for 10 minutes on a cutting board, then cut and serve.

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