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Coat 12 muffin cups with nonstick cooking spray.
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In a mixing bowl, add the flour, cocoa powder,sugar, baking soda, and salt; stir to combine.
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In another bowl, add the milk, oil, eggs, and vanilla; whisk until blended.
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Add the liquid ingredients and 1/2 cup chocolate chips to the dry ingredients.
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Stir just until dry ingredients are moistened; be careful not to overmix.
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Pour batter evenly into muffin cups.
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Sprinkle remaining chocolate chips evenly over muffin batter.
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Bake at 400 degrees for 20-22 minutes or until pick comes out clean.
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Place pan on a wire rack to cool for a few minutes before removing muffins from pan.