Cook the ground beef in a large Dutch oven over medium heat until browned. Drain off any excess fat and move the cooked beef to one side of the pot.
Add the diced onions and peppers and cook until onions begin to turn soft and translucent (about 8-10 minutes).
Add the drained and rinsed beans, diced tomatoes, marinara sauce, water, chili powder, and salt. Stir well, cover, and let simmer on low heat for 30-60 minutes, stirring occasionally.
Garnish with hot sauce, cheddar cheese, sour cream, and green onions. Serve hot.