Blackberry Peach Upside Down Cake

Peaches are in season and super sweet and delicious (or I got lucky with the ones that I've bought).  I've already made a peach crisp, eaten plain peaches and now decided to pair them with some blackberries to make this upside down cake.

Blackberry Peach Upside Down Cake 

Bottom layer ~

1/4 cup butter, melted
1/2 cup brown sugar

Pour the melted butter in a lightly greased 9" springform pan.  Sprinkle brown sugar evenly over the butter.  Add slices of 2 peaches and fresh blackberries in a circular pattern.

Cake layer ~

1/2 cup butter, softened
3/4 cup sugar
1/2 tsp cinnamon
1 large egg
1 tsp vanilla
1 1/4 cups flour
1 1/4 tsp baking powder
1/4 tsp salt
1/2 cup buttermilk

In a medium bowl, cream together softened butter and sugar.  Add in cinnamon, egg, vanilla and buttermilk.  Fold in flour, baking powder and salt.  Evenly spread cake mixture gently over the peaches.  Bake in a 350° for 50 minutes.  Place a piece of aluminum foil under pan because it might leak peach juice during baking.  Allow the cake to cool for 15 minutes before carefully turning over onto a serving plate.