Put strawberries in a ziplock bag and crush them fine with a rolling pin. Melt white chocolate chips in a microwave-safe bowl according to the package directions and stir in lemonade mix. Drizzle this mixture over the popcorn in a large bowl and stir well. Sprinkle with the strawberry powder, the lemon zest, and sprinkles, and stir again. Spread the popcorn on a waxed paper-covered baking sheet to set.