Pinata Pumpkin Chilli

1 lb ground beef
1/2 c onion, chopped
1 clove garlic, minced
1 15-oz can pumpkin (NOT pie mix)
2 c water
1 16-oz can red kidney beans, drained
1/2 c sliced, pitted olives- optional
1 envelope taco seasoning (your favorite)
1 1/2 tsp chili powder
1 tsp salt
1 c grated cheddar cheese
1 cup corn chips, crushed
1/2 c sour cream

In large soup pan cook meat, onions, and garlic until meat is browned. Drain and add pumpkin, water, beans and olives. Stir in taco seasoning, chili powder and salt. Simmer covered for 30 minutes. Serve each bowl with garnished with cheese, chips and sour cream.