Preheat your oven to 400°F and grease a 9x13-inch baking dish. In a large skillet over medium heat, cook the ground beef with the chopped onion and bell pepper until the meat is browned and the vegetables are soft. Drain off any excess fat.
Season the beef with salt and pepper. Stir in the diced tomatoes and let it cook for 5 minutes. Then add the taco seasoning mix and hot water, bring the mixture to a boil, and reduce the heat to let it simmer for another 5 minutes until thickened.
Transfer the meat mixture to the prepared baking dish and spread the drained corn evenly on top. Follow the package directions to prepare the corn muffin mix and spread it over the corn. Bake for 20 minutes, or until the topping is puffed and golden.
Top with sliced green onions, black olives, and shredded cheddar cheese before serving. To add an extra special touch, serve with sour cream, salsa, and your favorite sides.