Blueberry Lemon Upside Down Cake - Foodness Gracious

Ingredients

• 4 tablespoons unsalted butter
• 1/2 cup sugar
• 2 teaspoons lemon zest
• 1 tablespoon fresh lemon juice
• 2 1/2 cups fresh blueberries
• 1 1/2 cups all purpose flour
• 1 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 1 stick butter at room temperature (4oz)
• 1 cup sugar
• 1 tablespoon lemon zest
• 1 teaspoon vanilla extract
• 1/2 teaspoon lemon oil
• 2 large eggs