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Pre-heat oven to 350°F.
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In a large mixing bowl, cream the butter, sugars, and peanut butter.
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Add the eggs one at a time and then add vanilla. Beat until creamy.
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In another bowl sift together the baking powder, baking soda, salt, and flour.
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Slowly add to the mixing bowl with motor on low.
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Mix in white chocolate chips, peanuts, and candy corn just until combined. Do not over-mix.
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Spread the mixture into a 9x13 greased baking dish.
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Bake at 350°F for 20-25 minutes.
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Let cool completely.
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Cut into 24 squares.