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Preheat the oven to 350°F. Line a standard muffin pan with paper muffin cups.
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In a large mixing bowl, whisk together the cocoa, flour, sugar, baking powder, espresso powder, baking soda, salt, and 1 cup of walnuts. Set aside.
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In a large measuring cup or medium-sized mixing bowl, whisk together the eggs, bananas, milk, and maple syrup. Add melted butter and stir.
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Add the wet ingredients to the dry ingredients and stir by hand.
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Scoop the batter into the prepared muffin pans, filling to the top with batter.
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Add remaining walnuts and chocolate chips on top of batter before baking.
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Bake the muffins for 20 to 25 minutes, or until a tooth pick inserted in the center of a muffin comes out clean.
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Remove the muffins from the oven and allow to cool for 5 minutes before removing.