Gather all your ingredients on the counter. Having everything ready will make the process smooth and efficient.
Cut the tomatillos in half and set them aside. These little green gems are the star of the show and will give your dressing that signature flavor.
In your blender or food processor, combine the buttermilk, mayonnaise, ranch seasoning mix, halved tomatillos, garlic cloves, chopped cilantro, lime juice, and jalapeño.
Blend the mixture on high until everything is well combined and smooth. You want a creamy consistency without any chunks.
Taste your dressing and adjust the flavors as needed. If you want more heat, add a bit more jalapeño. If it’s too tangy, a little extra mayonnaise can balance it out.
Transfer the dressing to a storage container and refrigerate for at least 30 minutes before serving. This allows the flavors to meld beautifully.