Shelf-Stable White Chocolate Ganache Buttercream
- 2 cups butter (room temperature, but still slightly cool)
- 145 grams white chocolate wafers (we use White Chocolate Van Leer Chips from Orson Gygi)
- 57 grams boiling water (about 2 ounces)
- 830 grams powdered sugar
- 1/2 tsp. salt
- 1 tsp. vanilla