Preheat the oven to 350°F
Grease a round cake pan or pizza pan
Cream together softened butter, brown sugar, and granulated sugar
Beat in eggs and vanilla extract
Mix in flour, baking soda, and salt
Stir in chocolate chips or other mix-ins
Spread the dough evenly into the prepared pan
Bake for 18 to 25 minutes, until golden around the edges
Let the cookie cake cool completely in the pan
Remove from the pan and decorate with frosting if desired
Slice and serve