I really wanna share the recipe of this mouthwatering homemade cake with secret ingredient to give bittersweet  flavor to cake, the another reason for using plums is i had overripe plums in my fridge and don't wanna throw them. So gave a thought to make compote out of it and used that compote to bake a cake and it turned out so well. You can also use your leftover compote serving with Greek yogurt or bake yogurt.
INGREDIENTS
- 10 tablespoon butter, at room temperature, plus more for the pan
 - 1 cup light brown sugar
 - 1/2 cup yogurt
 - 1.5 cups unbleached all purpose flour
 - 1/3 cup unsweetened cocoa powder
 - 1 teaspoon baking powder
 - 1 teaspoon vanilla extract
 - 2 tablespoon plum compote
 - 1/2 cup chocolate chunks
 - 1/2 teaspoon salt
 
For compote- 300ml boiling water
 - 150 gram caster sugar
 - 500 gram plums, stones removed
 - 1 cinnamon sticks
 - 1/2 teaspoon ground nutmeg 
 
METHOD:- Heat a large saucepan and pour in the boiling water. Add the sugar and let the mixture bubble for 30 seconds.
 - Add the plums and cinnamon sticks and  and let it simmer for 10-12 minutes.
 - Remove the plums, and simmer the sauce, stir gently until it thickens, then pour over the plums and leave to cool before adding.
 
BAKE THE CAKE- Preheat the oven at 180'C, with a rack in the middle position, butter a 9'inch pan.
 - In a large mixing bowl, beat the butter and sugar, until creamy for 2 to 3 minutes.
 - Add yogurt, vanilla extract and plum compote beat for another minute, then add chocolate chunks and nicely fold in batter.
 - Add the flour, baking powder, cocoa powder and salt and mix well.
 - Bake for 35 to 40 minutes, or until set. Don't overbake, or the cake will be dry.
 - Cool completely, remove the sides of the pan, and serve.