Divide the cookie dough into 1.5 tablespoon-sized balls using a medium-sized cookie scoop and place on the prepared baking sheets. Add a few extra M&M candies and sprinkles and press them in.
Bake for 10-12 minutes. The cookies will puff up and have slightly cracked tops, make sure not to overbake them. Remove from the oven, and add candy eyes if using. Allow to cool for at 10 minutes then transfer to a wire rack to cool completely.