Combine all ingredients (scrape avocado from skin) except for chopped chives in the bowl of a food processor. Pulse a few times, scraping the bowl once or twice if necessary. Continue pulsing until salad reaches the consistency you want: chunky or more smooth!
Remove blade from bowl and stir in chives. Check seasoning and adjust as necessary.
Serve on a sandwich (spread bread with a mix of Dijon and mayonnaise) or serve on a thick slice of tomato as a cool salad. Sprinkle on extra chives to make it purty.