Prepare cake batter as directed on package; stir in the crushed candies. Spoon into 24 paper-lined muffin pan caps
Bake cupcakes 18 to 20 min. or until toothpick inserted in centers comes out clean. Cool cupcakes in pans 10 min. Remove from pans to wire racks; cool completely.
Drizzle each cupcake with lime juice once the cake is cooled.
Beat butter in large bowl with mixer until creamy. Gradually add sugar, mixing well after each addition. Blend in milk, 1 Tbsp. at a time, until frosting is of desired spreading consistency. Beat in vanilla, then remaining lime zest and lime juice until blended
Spread or pipe frosting onto cupcakes; sprinkle with Sour Patch Kids Candy and Sour Patch Kids Candy Pop Popcorn. Enjoy!