01 - Preheat oven to 375°F.
02 - Boil egg noodles according to package directions. Drain and set aside.
03 - In a large skillet over medium heat, cook ground beef until evenly browned. Drain excess fat.
04 - Add onion, garlic, and bell pepper to skillet. Sauté for 3 to 4 minutes until vegetables are softened.
05 - Stir tomato sauce, diced tomatoes, beef broth, oregano, basil, salt, and black pepper into the skillet. Simmer for 5 minutes.
06 - Remove skillet from heat. Add cooked noodles and sour cream, mixing thoroughly until fully combined.
07 - Transfer mixture to a 9x13-inch baking dish. Spread evenly and top with shredded cheddar cheese.
08 - Place casserole uncovered in oven and bake for 20 to 25 minutes until cheese is melted and mixture is bubbling.
09 - Garnish with chopped parsley before serving, if desired.