Custard Pie
["2 egg yolks", "1/2 c. sugar", "1 c. milk", "2 Tbsp. flour", "1 tsp. vanilla", "1 Tbsp. butter"]
["Mix all ingredients together and pour into 8-inch unbaked pie shell.", "Bake at 350\u00b0 for 25 to 30 minutes."]
["egg yolks", "sugar", "milk", "flour", "vanilla", "butter"]