– 2 ½ cups (315 grams) all-purpose flour (spooned & leveled) – 1 teaspoon baking soda – 1 teaspoon ground cinnamon – ¼ teaspoon salt – ¾ cup (170 grams) unsalted butter (softened) – ¾ cup (150 grams) granulated sugar – ½ cup (100 grams) packed light or dark brown sugar – ½ cup (125 grams) mashed banana – 1 large egg yolk (room temperature) – 1 teaspoon pure vanilla extract – ¾ cup (90 grams) chopped walnut
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