Pumpkin Chili

I made this on Halloween, and it was the best chili I have ever made.  The pumpkin taste is not overwhelming, and the spices gave it a unique fall flavor.

2 pounds ground beef
1 large onion, diced
2 bell peppers, diced
2 15oz cans black beans
2 15oz cans tomato sauce
1 28oz can diced tomatoes
1 15oz can pumpkin puree
1 T pumpkin pie spice OR 1 1/2 tsp cinn., 1/2 tsp nutmeg, 1/4 tsp cloves, 1/2 tsp ginger
1/4 cup chili powder
2 tsp cumin
2 Tbl sugar

Brown and drain the ground beef.
Add the onion and peppers and saute 5 minutes
Add remaining ingredients and simmer at least an hour.