Homemade Pineapple Upside Down Cake Ingredients: - 4 tablespoons butter (room temperature, divided into 2 tablespoons and 2 tablespoons) - 1 cup packed brown sugar - 20 ounces canned pineapple rings (drained and patted dry) - 1 stick butter (room temperature) - 3/4 cup white granulated sugar - 2 large eggs (room temperature) - 1 teaspoon pure vanilla extract - 2 cups all-purpose flour - 1 teaspoon baking powder - 1/2 teaspoon baking soda - 1/2 teaspoon salt - 1/3 cup whole milk (room temperature