Cook ground meat over low heat with chopped onion, drain, and pour into crock pot.
Add pumpkin, diced tomatoes, and tomato sauce to crock pot.
Mix tomato paste with 1.5 cups water in a glass measuring cup. Add seasonings, mix well, and pour into crock pot.
Stir all ingredients in crock pot. If chili seems thick, add remaining 1 cup water.
Cook on low for 8-10 hours.