The following recipe from Bev Dunn calls for a box of custard mix. Add custard mix when yeast is dissolved. Add rest of ingredients in order. Let rise until double in size. Punch down and make walnut-size balls.
Grease tops and let rise again on greased cookie sheet.
Bake at 400 degrees about 8 minutes until light brown. Mix evaporated milk, sugar, salt, egg yolks, oil and whole egg together. Add boiling water, stirring as you add it. Immediately add dry yeast. Cover bowl and let set about 5 minutes, until yeast is dissolved and foamy.