Sauté the onion, salt and oil or broth until the onions are soft and browning. About 5 minutes.
Add the tomatillos, peppers, garlic, cilantro and oregano and cook until the tomatillos have released their liquid and everything is beginning to brown. About 7-8 minutes.
Next, take the mixture and carefully put it in a blender, making sure not to get burned. Pulse to chop. Make it as smooth as you prefer.
Serve with chips and on everything!
Notes
You can use other peppers you prefer like serranos or other hot peppers. Keep the total amount similar to maintain similar flavor.