01 - Set oven temperature to 375°F and allow to preheat completely.
02 - Boil egg noodles in a saucepan of salted water according to package instructions. Drain thoroughly and set aside.
03 - In a large skillet over medium heat, cook ground beef, breaking it up with a spoon, until evenly browned. Drain any excess fat from the skillet.
04 - Add diced onion, minced garlic, and bell pepper to the skillet. Sauté for 3 to 4 minutes until vegetables are tender and fragrant.
05 - Stir in tomato sauce, diced tomatoes with their juices, beef broth, oregano, basil, salt, and black pepper. Simmer mixture for 5 minutes, stirring occasionally.
06 - Remove skillet from the heat. Gently fold in the cooked egg noodles and sour cream until evenly coated.
07 - Transfer beef and noodle mixture to a 9x13-inch baking dish. Spread evenly. Sprinkle shredded cheddar cheese across the surface.
08 - Place dish uncovered in the oven. Bake for 20 to 25 minutes, or until casserole is bubbling and cheese is fully melted.
09 - Remove casserole from oven and let stand for a few minutes. Top with chopped fresh parsley before serving if desired.