Heat oven to 375. Lay parchment paper ( to fit a 14" round pizza pan,) down on pan. In lg bowl, beat butter, sugar, brown sugar and vanilla until fluufy.
Beat in eggs, one at a time. Slowly add in flours, salt and baking soda. Beat until blended. Stir in chocolate chips. Spread evenly onto parchment paper. Bake about 20-25 mins, or until lightly browned.
While still warm, gently press M % M's into dough at various places. Cool, slice into small slices.