Blueberry Plum Upside Down Cake

I had been itching for some time to make some kind of upside down cake. My family, love em to death, often think what I think sounds awesome sounds just too weird. Well, here I am my 3 day weekend alone, and all I can think to do is cook and bake haha. Of course where the heck is this stuff going to go but to my ever growing ass and thighs! eating all of it slowly makes a difference .. right? haha.. doubtful. Either way, they left and here I was with 8 plums and well as much as I love plums, I simply didn't see my self eating all 8! So I looked around and came across this recipe. I had everything! so of course it had to be made! Let me tell you, it should be made just because of its beauty! oh my it is a gorgeous cake and oh so tasty!

And I will admit, I was soo proud. I really can not think of the last time I baked an upside down anything, and this just came out amazingly! Make it again, oh yes!! with different fruits.. oh hell yes!! Pineapple is a must, Peaches and Raspberries would be amazing, even Nectarines, I am thinking limitless possibilities in my little mind!!!
Blueberry Plum Upside Down Cake:
1 1/4 c all purpose flour
1 1/2 tsp baking powder
3 Tbsp Margarine
1/4 c brown sugar
1 c white sugar
1 egg
1 tsp vanilla extract
3/4 c milk
4 black plums, pitted and thinly sliced (yup so didn't use all 8, I sliced up 5 of them though lol)
3/4 c blueberries (I had fresh ones I threw in the freezer recently, and simply sprinkled them around)

Preheat oven to 350. Grease a 9 in cake pan. Combine the flour, baking powder and salt. Set aside.
In the prepared pan, combine 3 tbsp margarine and brown sugar. Place pan inside the preheated oven. until the margarine melts and begins to bubble. Set aside. In a large bowl, cream together the 1/3 c margarine and 1 cup white sugar until light and fluffy. Beat in the egg, then the vanilla. Beat in the flour mixture alternately with the milk, mixing just until incorporated.
Arrange plums around the edges of the prepared pan, overlapping slightly. Distribute the blueberries in the center. Pour batter into prepared pan, covering fruit completely. Bake in the preheated oven for 40 minutes or until a toothpick inserted into the center of the cake comes out clean. Allow to cool 15 min before serving.