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Preheat oven to 350ยบ.
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In a medium bowl, add cocoa powder, flour, salt and baking soda. Set aside.
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Using the bowl of a stand mixer, or a large bowl, add butter and sugar. Mix on medium speed until combined and creamy.
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Add one egg at a time, mixing well. Pour in vanilla.
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Slowly add bowl of dry ingredients using low speed.
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Fold in white chocolate chips and mini marshmallows.
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Line a cookie sheet with parchment paper or a silicone liner. Using a Tablespoon, drop cookies in rows of 3. The will spread quite a bit!
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Bake 8-9 minutes. Do not overcook!
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Allow to cool for 5-10 minutes before putting on a cooling rack.