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Preheat the oven to 350 degrees and grease a 9-inch cake pan. Set aside.
Using a stand mixer or hand mixer, cream the butter, brown sugar and white sugar together for 2 minutes and then blend in the egg, egg yolk, and vanilla.
Add the flour, baking soda and salt and mix until combined. Use a wooden spoon or spatula to mix in all but 2 tablespoons of chocolate chips.
Press the cookie dough into the cake pan until evenly distributed. If using your hands, wet your hands lightly so the batter doesn’t stick. Sprinkle the remaining 2 tablespoons of chocolate chips on top and press them down slightly.
Bake for 22-25 minutes until the top is golden brown. Let the cookie cool completely and then run a knife along the edge to loosen. Transfer to a platter. Pipe on frosting along the edges and add the sprinkles. If you don’t want to pipe frosting you can simply spread on top.
Beat all the frosting ingredients together until smooth, adding milk as needed. If adding food coloring, add one drop at a time, mixing well until desired color. Place into a piping bag and pipe on frosting if desired. Sprinkle on the sprinkles.