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Export 5 ingredients for grocery delivery
Step 1
Prepare cake batter and bake as directed on package for 13x9-inch pan. Cool cake in pan 15 min. Pierce cake with large fork at 1/2-inch intervals.
Step 2
Add boiling water to jelly powder in small bowl; stir 2 min. until completely dissolved. Stir in cold water; pour slowly over cake. Refrigerate 3 hours. Meanwhile, toss berries with dry drink mix. Refrigerate until ready to serve.
Step 3
Frost cake with Cool Whip; top with berries.