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Cream butter and sugar for about 1 minute with a mixer until creamy.
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Add egg and vanilla and mix until combined.
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Add cocoa, flour, cornstarch, salt, baking powder, and soda. Mix until combined.
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Add M&M’s.
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Roll into 1 to 1 and 1/2 tablespoon balls and refrigerate for 10 minutes or more.
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Once they are chilled, cook at 350 F for 6-9 minutes or store in a sealed bag until use.
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*If you don’t like or have dutch processed, just substitute the baking powder/soda for 1/2 teaspoon baking soda.