Place tomatillos, jalapeno, onion, lemon juice, garlic powder, half of the chopped cilantro and salt into the blender. Blend until smooth and taste for seasoning. Add more salt if necessary.
Add avocado, olive oil, and remaining cilantro and blend to desired consistency.
Enjoy now, or store refrigerated for up to two weeks. (The acidity from the tomatillos and lemon juice will keep it from turning brown.)
Recipe by Cookin' It Real at https://www.cookinitreal.com/2017/01/19/guaca-salsa/