Ingredients

1/2 cup vanilla yogurt
1 cup white sugar
1/2 cup vegetable oil
3 eggs
1 teaspoon vanilla extract
2 cups cake flour
2 teaspoons baking powder
4 (1 ounce) squares unsweetened chocolate, melted
3 fluid ounces sweetened condensed milk
3 tablespoons milk

Directions

Preheat oven to 325 degrees F (165 degrees C). Grease and flour a 9 inch square pan. Sift together the flour and baking powder. Set aside.

In a large bowl combine together yogurt, sugar, eggs, oil and vanilla. Beat on medium speed for 2 minutes. Beat in flour mixture until smooth.

Pour batter into prepared pan. Bake in the preheated oven for 45 minutes, or until a toothpick inserted into the center of the cake comes out clean.

To make the Frosting: In a medium bowl combine the melted chocolate and sweetened condensed milk. Beat for 2 minutes. Pour in 3 tablespoons milk and beat until creamy. Frost cake while still warm.