Choose your swap by method: use rendered poultry fat for sautéing/pan-frying; use ghee/butter for baking or when you want a softer flavor.
Measure using the listed ratio. If the substitute is more buttery (ghee/butter), start slightly under and top up once you taste.
For cooking: heat until it shimmers, then brown your aromatics/meat normally. For baking: use the fat directly and watch browning time (buttery swaps can brown faster).
Boost savory depth if needed—salt, a touch of umami (like mushroom powder), or a small splash of broth helps the flavor land closer to schmaltz.
Taste at the end and adjust: add salt for fat substitutions that taste flatter, or reduce added liquids if using oil+reduction.