Measure your mayonnaise and sour cream carefully. Place them into your small mixing bowl. Use a spatula to get every bit out.
Step 2:
Add the garlic powder and onion powder now. Sprinkle the dried parsley over the top. Add a pinch of salt and black pepper.
Step 3:
Pour in the buttermilk and the lemon juice. These liquids will help thin the thick base. Start with a small amount of buttermilk first.
Step 4:
Use your whisk to stir everything together. Move the whisk in a circular motion. Blend until you see no more white lumps.
Step 5:
Taste the sauce with a small clean spoon. Add more salt if you want more flavor. Stir one last time to finish the process.
Step 6:
Cover the bowl with a piece of plastic. Put the sauce in the fridge for an hour. This lets the flavors blend together well.
Notes
Use fresh lemon juice for a very bright flavor.Chill the sauce for one hour before you serve.Add more buttermilk if you want a thinner sauce.Keep your dried herbs fresh for the best taste.Whisk the sauce vigorously for a very smooth texture.Adjust the salt at the very end of mixing.