Strawberry Rhubarb Upside Down Cake with Whipped Cream - cookrisp

Ingredients

• 2 tablespoons butter, melted
• 1/3 cup packed brown sugar
• 1 cup sliced fresh strawberries
• 1 cup chopped fresh rhubarb
• 1/2 cup unsalted butter, at room temperature
• 2/3 cup granulated sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 1 1/3 cups all-purpose flour
• 1 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 2/3 cup buttermilk
• Whipped cream