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Preheat oven to 375 degrees F. Coat a baking sheet with non-stick cooking spray or butter.
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In a large mixing bowl, beat together butter, brown sugar, sugar, eggs, and vanilla.
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In a medium bowl, combine flours, salt, and baking powder. Add the flour mixture to the butter mixture in two additions; mix until just combined after each addition.
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Stir in chocolate chips.
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Spoon large dollops of cookie dough onto your prepared baking sheet. Form each cookie into a ball. Press a generous amount of M&Ms onto the tops of the dough balls.
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Bake for 9 to 11 minutes. Cool for a couples minutes on the baking sheet, and then remove to wire racks to cool completely.