Scoop out the avocado and mash them up in a large bowl. (I do not over mash because I like big chunks here and there.) Add the onion, tomatoes, and cilantro and jalapeno pepper if using. Mix well. Add the seasoning salt and salt and pepper.
Add the lime juice and mix well. Done!
Serve with chips (I use Siete), crackers (Simple Mills is great), or some veggies.