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Preheat oven to 350ºF.
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Mix sugar and butter in large bowl with electric mixer. Add in egg and vanilla. Beat until well combined.
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Stir in flour and baking soda.
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Gently mix in 1 cup chocolate chips.
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Pat dough out evenly on ungreased 12-inch pizza pan.
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Bake 14 to 16 minutes or until a light golden brown.
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Cool completely in pan.
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In small microwavable bowl, melt 1/2 cup milk chocolate chips and 1/2 cup peanut butter chips in 30 second intervals, stirring each time. (Approximately 1 minute total)
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Spread melted chocolate over top of cookie pizza.
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Immediately top with candies and left over peanut butter chips.
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Cut and serve when toppings are set.