These easy funfetti cake mix cookies have crinkly tops and soft, chewy centers. The sprinkle-filled cookies have a sweet, nostalgic funfetti flavor. This recipe requires only five ingredients and is ready in minutes.
Preheat the oven to 350℉. Line two baking sheets with parchment paper and set them aside.
Mix the cake mix, egg, egg yolk, vanilla, and cooled melted butter in a large bowl until smooth and incorporated. Fold in the sprinkles.
Scoop cookie dough using a medium cookie scoop. Shape dough into balls using your hands. Place cookie balls onto the prepared baking sheets, leaving 2 inches of space between the dough balls. **Note: Chill the dough for 30 minutes to one hour before baking for less spread and thicker cookies.
Bake cookies for 10-12 minutes until set and lightly golden around the edges.
Allow the cookies to cool for a few minutes before transferring them to a wire cooling rack.