Line a large baking sheet with parchment paper and spread out the pretzel pieces and mini marshmallows evenly.
In a microwave-safe bowl, melt the white chocolate chips in 30-second intervals, stirring after each round until smooth.
Drizzle the melted white chocolate over the pretzels and marshmallows, tossing gently to coat everything evenly.
While the chocolate is still warm, sprinkle in the pastel M&Ms, Easter-colored sprinkles, and drizzle the melted pastel candy melts in decorative patterns.
Let the mixture cool completely at room temperature or refrigerate for 15 minutes to set.
Once firm, break into bite-sized clusters and serve or store in an airtight container.