01. In a stand mixer, mix butter and vanilla bean seeds (if using) until broken up and smoothed: DON'T WHIP.
02. Add powdered sugar and slowly mix for 3 minutes. It will look like crumbly breadcrumbs at first, then it will slowly come together into a giant mass.
03. Increase mixer to high and immediately add 1 tsp boiling water. Mix 20 seconds and stop. This will bring the frosting together and melt away graininess from the sugar.