Using a stand mixer (or hand mixer + large bowl), add the cake mix, egg, and cool whip. Mix on medium speed until batter this tick, about 3 to 5 minutes. Check batter consistency; if it's too thick to scoop, add 1 to 2 tablespoons of water, then mix until incorporated.
Remove bowl from mixer. Add 3/4 cup of M&M's to batter, then use a spatula to gently fold within the dough.
Using a cookie scoop, scoop up dough, then roll dough into a ball. Drop ball in powdered sugar and toss to coat completely. Place sugar-coated cookie ball on the prepared baking sheet. Repeat this step until all the cookie dough batter is used, spacing cookies 2 inches apart.
Using the remaining 1/4 cup of M&M's, press candies in the top of crinkle cookies as desired.
Bake cookies for 10-12 minutes or until tops of cookies are lined with cracks (as pictured). If baking two cookie sheets at once, rotate baking sheets halfway through cooking time.
Let cookies cool on the baking sheet for 5 minutes before transferring to a wire cooling rack to cool completely.
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