Melt Butter and Marshmallows: In a large pot over low heat, melt the butter. Add the mini marshmallows and stir until smooth and melted. Remove from heat to prevent burning.

Mix in Cereal: Stir in the Rice Krispies cereal, making sure each piece is coated with the marshmallow mixture. The mixture will be sticky, so fold gently.

Add the Sprinkles: Fold in 1/2 cup of pastel sprinkles, mixing carefully to avoid smearing the colors.

Shape into Eggs: Lightly spray your hands with non-stick cooking spray. Scoop 1/4 cup of the mixture and shape it into an egg. Place on a parchment-lined tray.

Decorate: Press a few extra sprinkles onto the surface before they cool completely. Let them set for at least 20 minutes before serving.