Ingredients
6 ounces white baking chips1/4 cup heavy whipping cream1 tablespoon vanilla bean paste1 tablespoon vanilla extract6 large egg whites, room temperature1-1/2 cups sugar1/2 teaspoon cream of tartar1/2 teaspoon salt2 cups unsalted butter, cubed
Preparation
In a microwave, melt baking chips with cream until smooth, stirring every 30 seconds. Stir in vanilla paste and extract. Set aside to cool slightly. Meanwhile, in a heatproof bowl of a stand mixer, whisk egg whites, sugar, cream of tartar and salt until blended. Place over simmering water in a large saucepan over medium heat. Whisking constantly, heat mixture until a thermometer reads 160°, 8-10 minutes.
Remove from heat. With whisk attachment of stand mixer, beat on high speed until cooled to 90°, about 7 minutes. Gradually beat in butter, a few tablespoons at a time, on medium speed until smooth. Beat in cooled baking chip mixture until blended.
