1-First, preheat your oven to 375°F (190°C) and line your baking sheets with parchment paper to prevent sticking. In one bowl, mix together the dry ingredients: 1 2/3 cups all-purpose flour, 1 teaspoon cornstarch, 1 1/2 teaspoons baking powder, 1/2 teaspoon baking soda, and 1/2 teaspoon salt until well combined.

2-Next, in another bowl, beat 5 tablespoons of softened unsalted butter and 1 cup packed light brown sugar until the mixture is fluffy and light. Then, add 1/4 cup mashed ripe banana, 1 teaspoon vanilla extract, and 1 large egg at room temperature, blending everything until smooth. Gradually stir the dry mixture into the wet ingredients just until combined, being careful not to overmix.

3-Now, fold in 1 cup crushed banana chips and 1/2 cup chopped walnuts for that extra crunch and flavor. Scoop the dough onto your prepared baking sheets, spacing the portions about 2 inches apart. Bake for 10 minutes or until the edges are lightly browned, then let the cookies cool on the pan for 5 minutes before moving them to a wire rack.