Grease a pie pan and place plums cut side down in it

Heat water and sugar over medium heat without stirring til caramel and immediately pour over the plums

Preheat oven to 350°F

Cream butter and sugar. Then add eggs one at a time.

Mix in sour cream, lemon zest, and vanilla

In another bowl mix dry ingredients and then add to butter mixture. Mix until just incorporated

Pour over plums and spread evenly. Bake for 30 to 40 min.

Let cool for 15 min and invert onto a plate