- 1/2 cup (1 stick) unsalted butter
- 2 ounces unsweetened chocolate, chopped
- 1/2 cup unsweetened cocoa powder
- 1 teaspoon vanilla extract
- 2 cups powdered sugar
- 1/3 cup plain low-fat yogurt
- Tangy Chocolate Frosting Plain yogurt is the secret ingredient.Melt butter and chocolate in heavy small saucepan over low heat, stirring constantly until smooth. Transfer to large bowl. Whisk in cocoa and vanilla. Whisk in 1 cup sugar and yogurt. Whisk in remaining 1 cup sugar.