
You will fall in love with how chewy but crunchy these Cornflake Cookies are! The cookies are so soft and chewy and full of crispy mix-ins.
Preheat the oven to 350°F. Line large baking sheets with parchment paper.
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
In a large mixing bowl or the bowl of a stand mixer fitted with the paddle attachment, beat the butter and sugars on medium speed until light and fluffy, about 3 minutes. Add the egg and vanilla and beat well, stopping as needed to scrape down the sides during mixing.
Add the flour mixture and beat on low speed just until combined. Gently fold in the cornflakes, oats, and nuts until well incorporated into the dough. Using a 1½ tablespoons cookie scoop, drop the dough onto the prepared baking sheets about 2 inches apart. Press more cornflakes to the outside of the dough balls, if desired.
Bake one sheet at a time for 10 to 12 minutes or until the edges start to brown. Let the cookies cool on the baking sheet for a few minutes, then transfer to a wire rack to cool completely. Store cookies in an airtight container at room temperature for up to 1 week or frozen for up to 1 month.