Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking soda, salt, and cinnamon. Set aside.
In a large mixing bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy.
Add the egg and vanilla extract to the butter mixture and beat until well combined.
Mix in the mashed bananas until evenly incorporated.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. If using, fold in the chopped walnuts.
Using a spoon or cookie scoop, drop heaping tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake the cookies for 10-12 minutes, or until the edges are lightly golden. Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
To make the cream cheese glaze, beat the softened cream cheese until smooth. Gradually add the powdered sugar, milk, and vanilla extract, mixing until the glaze is smooth and drizzle-able.
Once the cookies are completely cool, drizzle or spread the cream cheese glaze over the top of each cookie.
Enjoy your Crumbl Banana Bread Cookies with Cream Cheese Glaze!