Peanut Butter Pie
["1 c. powdered sugar", "1/2 c. creamy peanut butter", "1 baked pastry shell (9-inch)", "1/4 c. cornstarch", "2/3 c. sugar", "1/4 tsp. salt", "2 c. milk", "3 egg yolks, beaten", "2 Tbsp. margarine", "1/4 tsp. vanilla", "3 egg whites (room temperature)"]
["Combine powdered sugar and peanut butter.", "Mix with fork until mixture resembles coarse meal. Spread half of the mixture in pie shell. Set remaining mixture aside."]
["powdered sugar", "peanut butter", "pastry shell", "cornstarch", "sugar", "salt", "milk", "egg yolks", "margarine", "vanilla", "egg whites"]