Preheat the oven to 375 F
Coat a LARGE loaf pan or 9″ round cake pan with cooking spray or oil.
In a large mixing bowl, combine the yogurt, eggs, sugar, vanilla, and oil.
In a separate bowl, combine the flour and baking powder.
Add the dry mixture to the wet mixture, stir until just combined. You can now add the chocolate chips or berries, if using them.
Scoop it all into your baking pan, bake for 35-45 minutes or until golden and the cake springs up when touched (or when a toothpick inserted is pulled out clean). Let it cool on a rack.
Optional: Dust with powdered sugar and/or serve with the Crème fraîche.