In microwave safe bowl combine marshmallows, white chocolate , butter and milk. Microwave on 100 percent power (high) for one minute. Stir the mixture until smooth. If needed, microwave again until melted.

Stir in vanilla and 1 and a half cup powered sugar. Mix until combined.

Sprinkle work surface with half cup powered sugar. Pour mixture onto the powered sugar and begin to knead. Sprinkle with powered sugar and work until no longer sticky.

If desired add color and knead it thru.