Step 1: Prepare the Cookie Cake

1. Preheat your oven to 350°F (175°C). Grease and line a 9-inch round cake pan with parchment paper.
2. In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
3. In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
4. Beat in the eggs one at a time, followed by the vanilla extract, mixing until well combined.
5. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Fold in the chocolate chips.

Step 2: Bake the Cookie Cake

1. Spread the cookie dough evenly into the prepared cake pan.
2. Bake for 25–30 minutes, or until the edges are golden and the center is set. A toothpick inserted should come out with a few moist crumbs.
3. Remove from the oven and let the cookie cake cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely.

Step 3: Make the Frosting

1. In a mixing bowl, beat the softened butter until creamy.
2. Gradually add the powdered sugar and mix until combined. Add the vanilla extract and enough heavy cream to reach your desired consistency.
3. Beat until the frosting is light and fluffy.

Step 4: Decorate the Cookie Cake

1. Once the cookie cake is completely cool, spread the frosting evenly on top.
2. Decorate with sprinkles if desired.
3. Cut into wedges and serve.