Step 1

Preheat the oven to 350°F.

Step 2

In a large mixing bowl, stir together the cake mix, oil, eggs, and sour cream until fully combined. Fold in rainbow jimmies until evenly distributed.

Step 3

Use a cookie dough scoop or tablespoon to drop the cookie dough in mounds onto a baking sheet lined with parchment paper. (We made 2 tablespoon size cookies.)

Step 4

Bake cookies for 11 minutes, until puffed and set.

Step 5

Allow cookies to cool for 1-2 minutes and then transfer to a cooling rack to cool completely.