01 - Set oven to 375°F and allow it to preheat fully.
02 - Boil egg noodles in salted water as directed by the package. Drain thoroughly and reserve.
03 - In a large skillet over medium heat, cook ground beef until fully browned. Drain off excess fat.
04 - Add diced onion, garlic, and bell pepper to the beef. Cook for 3 to 4 minutes until softened.
05 - Stir in tomato sauce, diced tomatoes with liquid, beef broth, oregano, basil, salt, and black pepper. Simmer on low heat for 5 minutes.
06 - Remove skillet from heat. Incorporate cooked noodles and sour cream, folding gently until evenly combined.
07 - Transfer mixture into a 9x13-inch baking dish, spreading into an even layer.
08 - Sprinkle shredded cheddar cheese uniformly over the casserole.
09 - Bake uncovered for 20 to 25 minutes until bubbling and cheese is melted.
10 - Allow to cool slightly. Garnish with chopped parsley before serving, if desired.