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Preheat oven to 350°F and lightly grease an 8 or 9 inch cake pan.
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With a mixer, cream the butter and sugars together for 2 minutes and then mix in the egg, egg yolk, and vanilla.
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Add the dry ingredients and mix until combined. Use a wooden spoon to mix in all but 2 tablespoons of chocolate chips and then press the cookie dough into the lightly greased cake pan.
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Sprinkle the remaining 2 tablespoons chocolate chips on top and press them down slightly.
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Bake for 22-25 minutes. Let the cookie cool completely and then run a sharp knife along the edge to loosen and then use a large spatula to transfer to a platter.
- If you would like to frost the cookie, or even do cute piping, this is a fantastic chocolate frosting recipe.
