Preheat oven to 325°F. Whisk flour and baking powder in a medium bowl, then combine with sugar.
Beat egg one at a time with milk, oil, yogurt and vanilla extract until well blended. Then combine with flour mixture, mix vigorously until well blended.
Lightly spray donut pan with oil. Pour batter into molds up to 2/3 full.
Bake 10 -12 minutes or until tops spring back when lightly touched and donuts are golden brown. Remove from oven and let it cool down before glaze or cinnamon and sugar if desired.
To make the ganache, heat heavy cream in a small pot. Be careful to not let it boil over. Once it begins to boil, remove from the stove.
Pour heavy cream into bowl of chopped chocolate. Stir and mix until chocolate is completely melted.
Let ganache cool for a few minutes before drizzling donuts with glaze or simply dipping the tops of the donuts in chocolate ganache.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.