Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan, dusting with flour.

In a large mixing bowl, blend 1 cup of yogurt and 3/4 cup of sugar until smooth. Add 3 eggs one at a time, whisking until the mixture is creamy.

In a separate bowl, whisk together 1 1/2 cups of flour, 2 teaspoons of baking powder, and 1/2 teaspoon of cream of tartar if using.

Fold the dry mixture into the wet mixture gently to retain air, mixing until just combined.

Pour the batter into the prepared cake pan and bake for 25-35 minutes, until golden and a toothpick comes out clean.

Cool in the pan for 10 minutes before transferring to a wire rack to cool completely.

Dust with powdered sugar before serving.