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In a medium bowl, mix together flour, cocoa powder, baking soda, and salt until well combined.
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In a large bowl, beat together butter and sugars until well combined. Add egg, milk, and vanilla. Mix to combine. Add food coloring. The batter should be a very rich red color. You can add more food coloring to your liking, but this was plenty red for me.
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Add dry ingredients to wet ingredients. Mix until dough forms, do not over beat.
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Refrigerate dough for 30 minutes.
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Preheat oven to 350 degree F. Line a cookie sheet with a Sil-Pat.
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Scoop cookie dough by the tablespoonful (or use a small cookie scoop) onto the prepared baking sheet. You can put 9 to 12 cookies depending on the size of your cookie sheet. Bake for 10 minutes. Remove from oven and allow cookies to cool completely.