Toss the chocolate chunks with 1 tablespoon of flour to coat them lightly. This prevents them from sinking to the bottom of the muffins.
In a large bowl, mix together the cake mix, eggs, milk, vegetable oil, and baking powder until well combined.
Fold in the flour-coated chocolate chunks gently into the batter.
Using a cookie scoop or spoon, fill the muffin cups about ¾ full with the batter.
Bake for about 20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.
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