Preheat the oven to 375°F. Wash the plums and slice them into thin wedges. If the plums are tart, sprinkle them with 2 tablespoons of sugar.
Add the eggs and granulated sugar into a medium size mixing bowl and beat together for about 2 minutes until they foam up and become slightly paler in color. It will also increase in volume.
Add the milk and vanilla and mix until combined.
Beat in the flour and salt until combined.
Butter a 9 inch pie pan or cast iron skillet and distribute the fruit evenly on the bottom.
Pour the batter evenly over the fruit and place it in the center of the rack of the preheated oven.
Bake for 10 minutes and then reduce the temperature to 350°F and bake for another 30-35 minutes.
When it is golden and puffed up, check for doneness by inserting a toothpick in the center. If it comes out clean it is done.
Remove it from the oven and let it cool for 15-20 minutes.
Generously dust with powdered sugar and serve it while it is warm. Enjoy!