Preheat your oven to 350°F (175°C). In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until fully incorporated. If you’re using chocolate chips, fold them into the dough at this stage.
Grease or line a round 9-inch cake pan with parchment paper. Press the cookie dough evenly into the bottom of the pan. Bake for 25-30 minutes or until the edges are golden and a toothpick inserted in the center comes out clean. Allow the cookie cake to cool completely in the pan on a wire rack.
Once the cookie cake has cooled, it’s time to decorate! Spread a thin layer of frosting on top of the cake, then use Halloween candy, sprinkles, and colorful icing to create a fun and spooky design. Use orange and black icing to write Halloween messages or add candy eyes and other spooky toppings to create a creepy look.