Buttermilk Substitute

For each 1 cup buttermilk called for in a recipe, use 1 cup plain yogurt or sour cream;

OR

1 tablespoon lemon juice or vinegar plus enough milk to make 1 cup;

OR

1 cup milk plus 1 3/4 tablespoons cream of tartar;

OR

1/4 cup buttermilk powder and 1 cup water.