Nothing says "party" like confetti cake! Now you can put a fun spin on this classic and learn how to make these delicious confetti cake cookies in just a few steps. Simply prepare your favorite boxed white cake mix, add a few colorful sprinkles or jimmies and you've got a full-blown party in every cookie. You can also customize your icing with your favorite sports team's colors or match any holiday celebration, then add a few more sprinkles on top to double the fun.
Preheat oven to 325°F. Prepare cookie slider with parchment paper.
In large bowl, stir together cake mix, eggs, butter, and 2 tablespoons jimmies until just combined. Drop by heaping tablespoons onto prepared cookie slider. Freeze for 15 minutes. Roll into balls. Space 2 in. apart on prepared cookie slider.
Bake 16-18 minutes or until centers of cookies are semi-firm to the touch. Cool cookies on pan on cooling grid 2 minutes. Remove from pan to cooling grid; cool completely.
For icing, in large bowl, beat shortening and butter with electric mixer until light and fluffy. Beat in vanilla. Gradually add sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. When all sugar has been mixed in, icing will appear dry. Slowly add milk and Wilton Color Right Base Color; beat at medium speed until light and fluffy.
Pipe or spread icing on cookies. Sprinkle remaining jimmies.