Heat oven to 350ºF. Spray 9-inch springform pan with pan spray.
In a double boiler, melt butter and chocolate together. In an electric mixer, combine eggs, yogurt, baking powder, sugar and salt and beat for 3-4 minutes until thick. Temper in chocolate to mixture.
Place springform pan on baking sheet and fill cake pan with chocolate mixture. Bake for 40 minutes or until a toothpick comes out clean.
Let cool.
For yogurt vanilla cream whip cream with sugar and vanilla paste to stiff peaks. Fold in Oikos® Plain Greek Yogurt. Serve vanilla cream with flourless chocolate cake.
