Identify what your recipe needs heavy cream for: baking richness, sauce body, or whipped topping.
Choose the closest substitute from the list: start with Whole milk + butter for the most “cream-like” fat, or Greek yogurt for thickness with a tang.
Measure by ratio, then adjust consistency: if it’s too thin, reduce a minute; if it’s too thick, whisk in small splashes of milk or water.
Before committing to the full recipe, test the mixture texture (batter ribbon/coat test, or sauce sheen) at the point you normally add cream.
If using dairy substitutes with tang (like yogurt), avoid overboiling to prevent curdling; warm gently and stir often.