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.
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.)
Bake cookies for 11 minutes, until puffed and set.
Allow cookies to cool for 1-2 minutes and then transfer to a cooling rack to cool completely.
Would you like to save this?
We'll email this recipe to you, so you can come back to it later!
Notes
Storage:For best results, store these cookies in an airtight container in a single layer for 5 days or freeze for up to 3 months.Notes:This Funfetti cookie recipe is super chewy and moist. They stay fresh for days! Regardless if the cookies are fully cooked or undercooked they will be soft. At 11 minutes, they were more chewy and slightly undercooked. As they cool, you can expect them to a little bit. When baked longer, they will be more cake-like and will stay fully puffed after baking.For more color, add more jimmies on top of the cookies before baking. However, with so many sprinkles in the batter, there is already a lot of color. Rainbow jimmies are the best to use because they don't bleed and melt when baking.