1 can (15 oz., I think) refried beans (stir in chili powder to taste)
1-2 avocados, mashed with lemon juice/guacamole
Chopped tomatoes
Sour cream
Sliced olives
Grated Cheddar cheese
Cooked ground beef seasoned for tacos
Chopped onions

Using the beans as your base. Layer these items on a serving platter or shallow pan or dish.

This is the order I usually use. Items may be omitted according to availability and preference. (Refried beans, sour cream, guacamole, taco meat, grated Cheddar, olives, onions, tomatoes.)

This looks fun and is a great addition to a Mexican dinner. Serve with corn or tortilla chips. Make sure they're the king-sized "dip" ones.