Preheat oven to 350ºF.
Grease your pan with oil spray and set aside
In a large mixing bowl, cream together sugar and butter. You’ll need an electric mixer for this step!
Add in eggs, flour, baking powder, salt, and vanilla and beat well.
Spoon batter into a springform pan.
Place plum halves skin side up on top of the batter. Don’t worry about creating a special pattern because they will sink as they bake.
Sprinkle a little cinnamon sugar on top.
Bake for 1 hour. Check regularly after the 40-minute mark and remove when set.
This torte freezes well!