Berry Best Upside-Down Cake | Gold Medal Flour US

Ingredients

• 1/3 cup butter or margarine
• 1/2 cup sugar
• 1 bag (12 oz) frozen mixed berries (blackberries, strawberries, blueberries and raspberries), thawed, drained
• 1 1/3 cups Gold Medal™ all-purpose flour
• 1 cup sugar
• 2/3 cup milk
• 1 teaspoon baking powder
• 1 teaspoon vanilla
• 1/2 teaspoon salt
• 1 egg