Question: how to substitute heavy whipping cream for evaporated milk?
Answer: According to the recipe website Allrecipes.com, a cup of heavy cream can be replaced with a cup of evaporated milk, or three-quarters of a cup of milk plus one-third of a cup of butter. "The Deluxe Food Lover's Companion" notes custards may be "enriched" with evaporated milk poured right from the can.