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Grease a 9x5 pan with vegetable spray. Also preheat your oven to 350 degrees Fahrenheit.
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In the bowl of your mixer cream together the butter and dark brown sugar.
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While the butter is creaming sift together the flour, baking soda and salt. I like to sift the ingredients onto a piece of parchment or foil. That way you can easily funnel the ingredients into the mixing bowl. Once you have the dry ingredients sifted, mash the four bananas into a small bowl.
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Once the butter and dark brown sugar are creamed together, turn the mixer to low and add the eggs one at a time. Make sure to fully incorporate the first egg before adding the second.
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Then add the bananas to the mixture.
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Once the bananas are fully incorporated, slowly add the dry ingredients. If you sift the ingredients onto a piece of parchment or foil your job will be a lot easier.
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Once everything is incorporated, remove the mixing paddle and add the walnuts. Mix them in by hand. Once incorporated, pour the batter into the prepared loaf pan.
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Place the loaf pan in the center of a preheated oven and bake for 1 hour, or until fully cooked. To check for doneness, insert a skewer into the center of the bread. When the skewer comes out cleanly, the loaf is fully cooked.
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Remove the loaf from the oven and let cool in the pan for at least 5 minutes. After the bread has slightly cooled, remove it from the pan and let it fully cool on a wire rack.