– 10 tablespoons (141 g) unsalted butter – 1½ cups (180 g) all purpose flour – 1 teaspoon ground cinnamon – ½ teaspoon baking soda – ½ teaspoon salt – ½ cup (100 g) light brown sugar – ¼ cup (50 g) granulated sugar – ½ cup (118 ml) mashed banana (about 1 large ripe banana) – 1 large egg yolk (US), room temperature – 1 teaspoon (5 ml) vanilla extract – 1¼ cup (212 g) chocolate chips, divided – 1 tablespoon flaky salt for topping, optional to taste
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