Plum CakeToo ripe (smushy) plums make this a bit more challenging but it still worked.
Batter for cake:
1 stick butter
1/2 c sugar
1 c flour
1 tsp baking powder
1 tsp vanilla or almond extract
For the top:
2 Tbsp sugar
1/4 tsp cinnamon (or more, I used more)
A number of plums
Prepare the batter as you would any batter: cream butter and sugar, add eggs, add flour and baking powder, add extract. Spread into a well-greased 10" pie pan.
Cut in half and pit the plums. Place them cut side down on top of the batter in the pan. If you can arrange them so that it will be easier to cut wedges when it is finished, that's a bonus.
Sprinkle the cinnamon sugar on top of the cake and plums.
Bake at 350 for 45 minutes. DO NOT EAT HOT as the plums hold in a lot of steam and you are apt to burn your mouth!