Silky Chocolate Buttercream Frosting

My choco-holic husband said about this icing:
"It's like eating a chocolate cloud."

What You Need:
4 Egg whites
1 cup Sugar
3 sticks (1 1/2 cups) Unsalted butter (at room temperature)
4 oz. Melted dark chocolate
1-3 Tbsp. Unsweetened cocoa powder (optional)
1 Tbsp. Vanilla (optional)
Special equipment, etc.:
Candy thermometer
Saucepan with about 1/2 inch water
Lemon juice or vinegar & paper towels
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