Instructions

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   Step 1: Preheat oven to 350 (F) OR 175 (C). Line an 9x9-inch baking pan with parchment paper. Spray lightly with non-stick baking spray and set aside
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   Step 2: In a large bowl, sift together the flour, baking powder, salt, cocoa powder, and espresso powder. Set aside until needed.
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   Step 3: 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.
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   Step 4: In a large mixing bowl, combine the eggs OR Large banana and remaining sugar. Whisk until well combined, about 30 seconds.
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   Step 5: Slowly, pour the warm butter mixture into the egg OR mushed banana mixture, adding it very gradually (a little bit at a time) and whisking constantly until completely combined
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   Step 6: Add in the dry ingredients and chocolate chips and, using a rubber spatula, slowly stir until just combined. *Do NOT over mix! Stop stirring when you see the last trace of dry ingredients. Over mixing will give you cakey brownies
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   Step 7: Scrape the batter into the prepared pan and smooth the top.
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   Step 8: Bake for 30 minutes, or until the edges are firm and the top is shiny and slightly cracked
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   Step 9: Place pan on a cooling rack and cool completely before slicing
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    Note:
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    For very gooey brownies, you'll want to pull them out closer to 27 minutes. For more structured brownies, let the, bake 30 to 32 minutes. Over mixing is the number 1 reason brownies come out cakey.