Questions cooks ask
What is the best substitute for butter?
Vegetable or olive oil: ¾ cup oil per 1 cup. Use ¾ as much, since oil is 100% fat. Great in muffins; not for creaming.
Why does butter matter in a recipe?
Butter is about 80% fat and 16–18% water. Swaps change texture and flavour, so match the job.