Add rinsed lentils, vegetable broth, diced tomatoes with their juices, diced onion, minced garlic, curry powder, cumin, salt, pepper, and diced carrots to the slow cooker.

Stir everything together to combine the ingredients evenly.

Cover and cook on low for 7-8 hours or on high for 4-5 hours, until lentils are tender and soup has thickened.

Taste and adjust seasonings as needed before serving.

Ladle into bowls and serve with fresh cilantro, a dollop of yogurt, or naan bread if desired.