01 - Set oven to 375°F (190°C) to preheat.
02 - Cook egg noodles according to package directions in boiling water until just tender. Drain and set aside.
03 - In a large skillet over medium heat, cook ground beef until fully browned, breaking into small crumbles. Drain excess fat.
04 - Add diced onion, minced garlic, and diced bell pepper to beef. Sauté for 3 to 4 minutes, stirring often, until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with juices, beef broth, dried oregano, dried basil, salt, and black pepper. Bring mixture to a simmer and cook for 5 minutes.
06 - Remove pan from heat. Gently fold in cooked egg noodles and sour cream until thoroughly combined.
07 - Transfer beef and noodle mixture into a 9x13-inch baking dish, spreading evenly. Sprinkle shredded cheddar cheese uniformly over the top.
08 - Place baking dish uncovered in preheated oven and bake for 20 to 25 minutes, or until casserole is bubbling and cheese is melted.
09 - Remove from oven. Allow to rest briefly before garnishing with chopped parsley. Serve warm.