01 - Set oven temperature to 375°F.
02 - Boil egg noodles according to package instructions until al dente, then drain and reserve.
03 - In a large skillet over medium heat, cook ground beef until browned, breaking up meat as it cooks. Drain excess fat.
04 - Add diced onion, minced garlic, and diced bell pepper to the skillet. Sauté for 3 to 4 minutes, stirring, until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with juices, beef broth, dried oregano, dried basil, salt, and black pepper. Simmer for 5 minutes to blend flavors.
06 - Remove the skillet from heat. Add cooked noodles and sour cream, mixing gently until well combined.
07 - Transfer the beef and noodle mixture to a 9x13-inch baking dish, spreading evenly.
08 - Evenly sprinkle shredded cheddar cheese over the casserole surface.
09 - Bake uncovered for 20 to 25 minutes, until the center is heated through and cheese is melted and bubbling.
10 - Scatter chopped fresh parsley on top before serving, if desired.