Low-Calorie Vegan Chili

Combine diced tomatoes, water, kidney beans, red beans, onion, tomato paste, mushrooms, yellow bell pepper, orange bell pepper, chili powder, garlic powder, and salt in a large saucepan over high heat. Bring to a boil, stirring occasionally. Reduce heat to medium-low and simmer, stirring occasionally, until all vegetables are tender, about 30 minutes.