Cut one large avocado in half lengthwise and remove the pit.

Use a spoon to scoop out the flesh, leaving behind a shell shaped like a bowl.

Cut the flesh into chunks, roughly equal in size.

Add chopped onion, lime juice, cilantro (or parsley), and chili powder (if desired).

Mash together until everything comes together.

Add salt, black pepper, and additional lime juice to taste.

Mix thoroughly.

Serve immediately with tortilla chips, corn chips, pita bread, crackers, etc., or refrigerate for later consumption.