Cranberry Upside-Down Cake

Ingredients

• 1 1/2 sticks (6 ounces) unsalted butter
• 3/4 cup packed light brown sugar
• 3/4 pound cranberries
• 11/2 cups flour
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 1 cup granulated sugar
• 2 egg yolks
• 1 teaspoon plus a few drops vanilla extract
• 1/2 cup milk
• 2 egg whites
• 1/4 teaspoon cream of tartar
• 1 cup heavy cream
• 1 tablespoon confectioners' sugar