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With a mixer, cream butter until light and fluffy, about 1 minute. Add in brown sugar and white sugar and mix until well combined.
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Add in the egg and vanilla extract. Mix.
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In a separate bowl, sift together flour, cocoa powder, baking soda, salt, and espresso powder. Once combined, slowly incorporate dry ingredients into wet ingredients. Mix until just combined.
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Add in M&M’s® Crispy, peanut butter chips, and semi-sweet chocolate chips. Mix. Once combined, chill dough in refrigerator for about 20 minutes (this makes the dough easier to work with).