Preheat your oven to 350°F (175°C) and prepare a springform pan with parchment paper.
Cream together the softened butter, light brown sugar, and granulated sugar until smooth and creamy.
Add the egg and vanilla extract; mix until fully incorporated.
In a separate bowl, combine the flour, cornstarch, baking soda, and salt. Gradually add to the wet ingredients, mixing on low speed until just combined.
Fold in the chocolate chips gently with a spatula.
Press the cookie dough evenly into the bottom of the prepared springform pan.
Bake for 18 to 22 minutes, until soft in the center. Switch to broil for 1 minute to brown the top slightly, but watch carefully!
Allow the cookie cake to cool completely in the pan on a wire rack.
For the frosting, beat the softened butter until creamy, then gradually add powdered sugar, milk, and vanilla extract until fluffy.
Divide frosting into bowls and add gel food coloring for decoration. Use piping bags to create a wreath design on the cooled cookie cake.
Finish with holiday sprinkles for a festive touch!
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Notes
Store in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.