8 ounces large egg whites
16 ounces granulated sugar
16 ounces unsalted butter, cubed and softened
Pinch table salt
1 teaspoon quality vanilla extract
You can flavor the buttercream by adding melted chocolate, espresso or a fruit puree. Add it gradually, mixing well between additions, until you achieve the desired flavor being mindful not to add so much that you change the consistency.