01 - Set the oven to 375°F (190°C) and allow it to fully preheat.
02 - Boil egg noodles in a saucepan according to package directions. Drain well and set aside.
03 - In a large skillet over medium heat, cook ground beef, breaking it into crumbles, until browned throughout. Drain any excess fat.
04 - Add diced onion, minced garlic, and diced bell pepper to the skillet with the beef. Sauté for 3 to 4 minutes until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with liquid, beef broth, dried oregano, dried basil, salt, and black pepper. Simmer the mixture for 5 minutes.
06 - Remove skillet from heat. Incorporate the drained noodles and sour cream, stirring until thoroughly mixed.
07 - Spoon the beef and noodle mixture into a 9x13-inch baking dish, spreading evenly. Sprinkle the top with shredded cheddar cheese.
08 - Bake uncovered for 20 to 25 minutes, until the casserole is bubbling and cheese has melted.
09 - Optionally garnish with chopped fresh parsley before serving hot.