Delicious plum blueberry upside-down cake that is perfect for any occasion

Ingredients

• 1/2 cup unsalted butter
• 1/2 cup brown sugar
• 2-3 plums, sliced
• 1 cup fresh blueberries
• 1 1/2 cups all-purpose flour
• 1 tsp baking powder
• 1/2 tsp salt
• 1/2 cup unsweetened applesauce
• 1/2 cup sugar
• 2 eggs
• 1 tsp vanilla extract
• 1/2 cup milk