Cake: Beat butter, granulated sugar and salt with electric mixer fitted with paddle attachment until fluffy. Add whole eggs, 1 at a time, beating well after each addition. Add combined flour and baking powder alternately with milk, mixing well after each addition, beginning and ending with flour mixture. Stir in SOUR PATCH KIDS Bitz and zest.
Divide mixture among 12 well-sprayed mini Bundt cake molds. Bake in 350°F standard oven 20 min. or until wooden pick inserted in centers comes out clean. Cool in pans 10 min. Remove cakes from pans; cool completely on wire rack.
Icing: Meanwhile, combine powdered sugar, egg whites and Variegate in bowl with a spatula. Cover. Refrigerate until ready to use.
For each serving: Drizzle 2 tsp. Icing over top of each cake. Sprinkle with 1 tsp. SOUR PATCH KIDS Bitz before icing sets.