Begin by rinsing one cup of lentils under cold water to remove any impurities. Dice one medium onion and set it aside. Grab your diced tomatoes and chili powder, measuring out what you need.

In your crockpot, layer the rinsed lentils, diced onion, and the can of diced tomatoes. Sprinkle in the desired amount of chili powder. Pour in four cups of vegetable broth.

Cover the crockpot and set it to cook on low for 6 to 8 hours or on high for 3 to 4 hours.

Check for doneness by ensuring the lentils are tender but not mushy.

Once cooked, taste the chili and adjust the seasoning as needed.

Ladle the chili into bowls and serve hot with your favorite garnishes.