Lemon Cream Cheese Frosting (from Crisco)

1 (14 ounce) can sweetened condensed milk
2 egg yolks
3 tablespoons lemon juice
1 teaspoon vanilla
1 (8 ounce) package cream cheese
Yellow food coloring (if desired)

in heavy saucepan, combine condensed milk, egg yolks and lemon juice. Over medium heat, cook and stir rapidly until thickened, 5 to 7 minutes. Stir in vanilla and yellow food covering (if desired). Chill at least 2 hours. In small bowl, beat cream cheese until fluffy. Gradually beat in lemon mixture until smooth.