1. Combine all ingredients except lime slices, tossing gently.
2. Cover and chill up to 4 hours. Garnish with lime slices, if desired. Serve dip with baked tortilla chips.
Note: More than half the fat in an avocado is monounsaturated--making it a high-fat food that's actually good for your heart. Use it in your favorite Mexican dish or thinly slice one for a quick sandwich.