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Preheat oven to 350 degrees and line two baking sheets with non-stick mats or parchment paper.
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In a mixing bowl, combine cake mix and baking powder. In another bowl, combine eggs, vanilla, and oil.
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Add wet ingredients into the dry and stir well until all cake mix is wet and no dry pockets remain.
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Gently fold in M&Ms.
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Drop two tablespoon rounded spoonfuls onto baking sheet about 2 inches apart.
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Bake for 9-10 minutes. Cookies should not brown at all.
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Remove from oven and let sit on baking sheet for at least 5 minutes before removing to a cooling rack.
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Store in an airtight container for up to one week.