Ingredients
Equipment
Method
- Preheat oven to 350°F. Chop half of your chocolate chips into smaller pieces using a sharp knife. This creates better chocolate distribution throughout your cookie cake and prevents large chunks that could cause breaking when slicing.
- Melt your butter in the microwave for 20-30 seconds until just melted. Transfer to a large mixing bowl and stir in both sugars by hand using a spatula. Add the egg and vanilla, mixing until combined.
- Incorporate the baking soda, baking powder, and salt before adding the flour. Mix until the flour disappears completely. Fold in your chopped chocolate chips and remaining whole chips.
- Grease an 11.5-inch round metal pan thoroughly. Drop small chunks of dough evenly across the pan, then press into a smooth, even layer about 1/2 inch thick. Separate any chocolate chips that are stuck together.
- Bake for 12-14 minutes. Your cookie cake is done when the top appears slightly brown but the center still looks barely set. Do not overbake. Remove from oven and cool completely in the pan.
- For Frosting: Beat softened butter for 2 minutes until smooth. Gradually add powdered sugar, then vanilla and salt. Add milk one tablespoon at a time until you reach piping consistency.
- To remove from pan, run a knife around edges, place serving platter on top, and flip quickly. Pipe frosting around edges using a large star tip and immediately add sprinkles.
Notes
Pan Alternatives: Use a 9x13 inch metal pan for rectangular shape, reducing baking time by 1-2 minutes. For DIY round pan, create foil ring around 11.5-inch bowl and bake on parchment-lined sheet (add 4-6 minutes baking time).
Storage: Unfrosted cookie cake keeps 2-3 days at room temperature. Frosted versions should be refrigerated after one day for best quality.
Make-Ahead Tip: Wrap cooled, unfrosted cookie cake in plastic wrap. Thaw to room temperature before frosting and serving.