01 - Set oven to 375°F (190°C) and allow to preheat.
02 - Boil egg noodles in a saucepan according to package directions; drain thoroughly and set aside.
03 - In a large skillet over medium heat, brown ground beef until fully cooked. Drain any excess fat and return beef to skillet.
04 - Add diced onion, minced garlic, and diced bell pepper to the skillet. Sauté for 3 to 4 minutes until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with liquid, beef broth, oregano, basil, salt, and black pepper. Simmer mixture for 5 minutes to meld flavors.
06 - Remove skillet from heat. Fold in cooked noodles and sour cream until evenly combined.
07 - Transfer the beef and noodle mixture into a 9x13-inch baking dish. Sprinkle shredded cheddar cheese over the top in an even layer.
08 - Bake uncovered in the preheated oven for 20 to 25 minutes, until the casserole is bubbling and cheese is melted.
09 - Remove from oven and allow to cool slightly. Garnish with freshly chopped parsley before serving if desired.