ROLL RECIPE:

In large bowl or electric mixer (i use my kitchen aid fitted w/a dough hook), combine water and milk powder; stir until milk dissolves. Add yeast, then sugar, salt, butter, egg, and 2 cups flour. Mix on low speed until ingredients are wet, then for 2 minutes at medium speed. Add 2 cups flour; mix on low speed until ingredients are wet, then for 2 minutes at medium speed. (Dough will be getting stiff and remaining flour may need to be mixed in by hand). Add about ½ cup flour and mix again, by hand or mixer. Dough should be soft, not overly sticky, and not stiff (It is not necessary to use the entire amount of flour).
Scrape dough off sides of bowl and pour about one tablespoon of vegetable oil all around sides of bowl. Turn dough over in bowl so it is covered with oil. (This helps prevent dough from drying out). Cover with plastic and allow to rise in warm place until double in size.