1-First, preheat your oven to 375ºF and line two baking sheets with parchment paper to prepare your workspace efficiently.

2-In a small bowl, combine 1 ⅔ cups (217 g) all-purpose flour, 1 teaspoon cornstarch (if using), 1 ½ teaspoons baking powder, ½ teaspoon baking soda, and ½ teaspoon salt.

3-Next, in a large bowl, beat 5 tablespoons of softened unsalted butter and 1 cup (210 g) packed light brown sugar until light and fluffy, then add ¼ cup (56 g) mashed ripe banana, 1 teaspoon vanilla extract, and 1 large egg, beating until well blended.

4-Stir the dry ingredients into the banana mixture until just combined to keep the dough tender.

5-Gently fold in 1 cup (80 g) crushed banana chips and ½ cup (56 g) chopped walnuts for that extra crunch.

6-Drop the dough using a 1.5-tablespoon cookie scoop about 2 inches apart on the prepared baking sheets.

7-Bake for 10 minutes or until the cookies are lightly browned, then cool on the pan for 5 minutes before transferring to a wire rack.