“You can substitute plain yogurt for the sour cream if you want to make it lower-fat.”

You're at a potluck lunch. Someone asks you about the dish that you made, so you're telling her about the recipe. You're talking about different options for the recipe, and you say:

You can substitute plain yogurt for the sour cream if you want to make it lower-fat.

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“I improvised on a recipe that I found in a magazine.”

You made a dish to bring to a potluck, and someone commented on how good it was. She asked where you got the recipe. You used a recipe from a magazine, but you made a lot of your own changes to it, so you say:

I just improvised on a recipe that I found in a magazine.

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