In a large bowl, combine the Chex cereal, mini marshmallows, pretzel sticks, and Easter M&Ms.
In a microwave-safe bowl, combine the white chocolate chips and vegetable oil.
Microwave in 30-second intervals, stirring in between, until the white chocolate is melted and smooth.
Pour the melted white chocolate over the trail mix and stir to coat evenly.
Immediately sprinkle with pastel sprinkles.
Spread the trail mix on a parchment-lined baking sheet to cool and harden.
Once the white chocolate is set, break the trail mix into pieces and store in an airtight container.