Simply stir ingredients together and let stand 5 minutes before using in any recipe calling for buttermilk. Be sure to make the appropriate measurement scaling adjustments needed for the amount of buttermilk called for in the recipe.
For Option 4
Whisk sour cream with milk until combined. Use in any recipe calling for buttermilk.
Video
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Notes
Plain yogurt can be used as a direct replacement for buttermilk.Non-dairy milk can be used in place of regular milk in options 1 through 3.