Preheat the oven to 400 while you rinse and quarter tomatillos and peppers. Remove ribs and seeds of peppers. Toss with a bit of olive oil, salt, and garlic powder and arrange on a baking sheet.
Roast your tomatillos and peppers at 400 for 15-20 minutes (20+ mins being more charred, 15 mins being just shy of charred).
Meanwhile, throw all other ingredients into a blender - avocado, cilantro, lime juice, grapes, shallot, garlic, salt, and paprika - wait to blend until your tomatillos and peppers are ready!
Remove tomatillos and peppers from oven and pour them directly into the blender with the other ingredients (including juices in the pan). Blend for about 20-30 seconds (less for chunkier salsa, more for runnier). Add more salt to taste!
Pour and serve immediately as a dip, drizzle over tacos, or alongside any meal! Enjoy!