Cranberry Upside-Down Cake
["2 Tbsp. butter", "3/4 c. light brown sugar", "2 1/2 to 3 c. cranberries", "1 c. sugar", "2 eggs", "1 egg yolk", "1/2 tsp. vanilla", "1 Tbsp. baking powder", "1/2 c. milk", "1 1/2 c. cake flour"]
["Spread butter evenly in bottom of 9-inch pan.", "Spread light brown sugar over the butter; pat it down.", "Spread cranberries over the sugar."]
["butter", "light brown sugar", "cranberries", "sugar", "eggs", "egg yolk", "vanilla", "baking powder", "milk", "cake flour"]