Place a large skillet over medium-high heat. Add the ground beef and cook for 8-10 minutes until it is browned through and there is no pink left. Be sure to break up the meat as it cooks. Drain any excess grease.
Add the onion and bell pepper to the skillet. Cook for about 5 minutes until the veggies have softened.
Add the chili powder, garlic powder, onion powder, salt, and pepper to the skillet and stir to combine. Cook for 5 minutes, stirring often.
Transfer the seasoned ground beef and veggies to a slow cooker. Add the diced tomatoes, tomato sauce, Rotel, salsa, chili beans, and black beans. Stir until well combined.
Cover and cook on LOW for 6-8 or on HIGH for 5-6 hours. (If possible, stir every 1-2 hours to prevent sticking.) To thicken slightly, remove the lid for the last 30 minutes of cooking.
Portion into bowls and serve warm with your favorite toppings, or enjoy as is.
Notes
Store any leftovers in the fridge in an airtight container for up to 3 days or freeze for up to 3 months.