When talking about recipes
What is the right expression? Instructions? Or directions?
I am creating a recipe card template for my students

Question

Answer

Instructions.

Instructions tell you what to do - for example, how to make a cake.
Directions tell you where to go - for example, how to get from the city centre to the airport.

Answer

I'm looking through some recipe sites and I see:
Directions (seriouseats.com, foodnetwork.com, allrecipes.com), Preparation (epicurious.com), Steps (pillsbury.com).

Two of the more standard American cookbooks  just list the ingredients and then let you know how to combine them.

I think you could use either "directions" or "instructions."

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