1: Melt butter in a large pot over medium heat.
2: Add mini marshmallows and stir until fully melted.
3: Stir in vanilla and green food dye.
4: Remove from heat and add Rice Krispies cereal, mixing until combined.
5: Press the mixture into a tree shape on a parchment-lined baking sheet.
6: Drizzle melted white chocolate over the trees and add sprinkles as decoration.
7: Allow to cool and harden before serving.
