1-Step 1: Prepare Your Oven and Pan Preheat your oven to 350°F (175°C). This temperature allows the cookie cake to bake evenly without burning the edges. While the oven heats, prepare your pan by greasing an 11.5-inch metal round pan with butter or cooking spray, or line it with parchment paper for easy removal. The parchment method guarantees your cookie cake releases cleanly every time.

2-Step 2: Prepare the Chocolate Chips Chop half the chocolate chips into small pieces using a sharp knife. Keep the remaining chips whole. This technique gives you the best of both worlds: the chopped pieces distribute evenly throughout the dough, ensuring chocolate in every bite, while the whole chips create those gorgeous melty pockets that make chocolate chip cookie cake so irresistible.

3-Step 3: Create the Cookie Dough Base Melt the butter in a microwave-safe bowl or on the stovetop. Pour the melted butter into a large mixing bowl and add both the brown sugar and granulated sugar. Stir by hand using a wooden spoon or spatula until the sugars are fully incorporated into the butter. This hand-mixing technique is actually preferred over using an electric mixer because it creates a denser, chewier cookie cake texture. The warmth from the melted butter helps dissolve the sugars slightly, which contributes to that beautiful crackly top on the finished cookie cake.

4-Step 4: Add Wet Ingredients Mix in the large egg and vanilla extract. Stir until the egg is completely beaten into the sugar-butter mixture and everything looks uniform. The egg provides structure while the vanilla adds that classic cookie flavor everyone loves. Don’t skip the vanilla it makes a noticeable difference in the final taste.

5-Step 5: Incorporate Dry Ingredients Add the baking soda, baking powder, and salt to the wet mixture. Stir until combined. Then add the flour, mixing just until no dry streaks remain. Be careful not to overmix at this stage, as too much stirring can develop gluten and make your cookie cake tough rather than tender.

6-Step 6: Fold in the Chocolate Gently fold in both the chopped and whole chocolate chips until they’re distributed throughout the dough. The chopped pieces will seem to disappear into the dough (that’s good they create chocolatey pockets), while the whole chips will be visible on the surface.

7-Step 7: Shape the Cookie Cake Drop the dough in chunks into your prepared pan. Press it into an even layer about ½-inch thick using your hands or the back of a spoon. Take a moment to separate any clumps of chocolate chips that have stuck together this ensures even distribution and cleaner cuts when you slice the finished cake. Important tip: Keep the dough at ½-inch thickness throughout. Thinner areas will become crispy, while thicker spots stay soft and chewy. Uniform thickness means every slice has the same perfect texture.

8-Step 8: Bake the Cookie Cake Place the pan in your preheated oven and bake for 12-14 minutes. Start checking at the 12-minute mark. You’re looking for the top to be lightly browned and the center to be set but still slightly underdone. The edges should look golden and firm, while the center might still look a bit glossy that’s exactly what you want for a soft, chewy texture. Remember, the cookie cake continues cooking for a minute or two after you remove it from the oven, so taking it out when it looks slightly underdone prevents overbaking.

9-Step 9: Cool Completely Let the cookie cake cool completely in the pan before attempting to remove it. This step is crucial if you try to move it while warm, it may break apart. The cooling process allows the structure to set properly, making it sturdy enough to transfer and decorate.

10-Step 10: Remove and Transfer Once completely cool, run a butter knife along the edges of the pan to loosen the cookie cake. Place a plate upside down over the pan and flip it over to release the cake. Then transfer it to your serving platter by placing the platter on top and flipping again so the cookie cake is right-side up.

11-Step 11: Prepare the Frosting (Optional) If adding frosting, beat the softened butter in a bowl until smooth. Gradually add the powdered sugar, vanilla extract, salt, and 1 tablespoon of milk. Beat until creamy. Add more milk as needed to reach your desired spreading or piping consistency. For writing messages, thin the frosting with an extra teaspoon of milk. Load the frosting into a piping bag fitted with a round tip and pipe around the edges of the cookie cake. Add sprinkles for decoration. If you want to write a message or cover the entire cake with frosting, double the frosting recipe.

12-Step 12: Slice and Serve Cut the cookie cake into 12 equal wedges using a sharp knife or pizza cutter. For the cleanest cuts, wipe the blade between slices. Serve at room temperature for the best chewy texture, and enjoy!