1 tsp. vanilla extract
3/4 cup heavy cream or half-and-half
9 oz. semi-sweet chocolate (about 1 1/2 cups semi-sweet chocolate chips)
1/2 tsp. salt, optional
1/2 tsp. baking powder
1 tsp. baking soda
1 cup all-purpose flour
1/2 cup unsweetened natural cocoa powder
1/2 cup brewed coffee, room temperature or warm
1 1/2 tsp. vanilla extract
1/4 cup canola or vegetable oil
6 oz. plain, vanilla, or chocolate yogurt (thicker Greek-style preferred, do not use diet, fat-free or light yogurt; sour cream may be substituted)
1 cup granulated sugar
1 large egg