01 - Set oven temperature to 375°F and allow to preheat fully.
02 - Cook egg noodles in a saucepan according to package directions, then drain thoroughly and set aside.
03 - Place ground beef in a large skillet over medium heat. Sauté until beef is well browned, breaking up the meat as it cooks. Drain and discard excess fat.
04 - Add diced onion, minced garlic, and diced bell pepper to the skillet. Cook for 3 to 4 minutes, stirring occasionally, until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with juices, beef broth, dried oregano, dried basil, salt, and black pepper. Reduce heat and simmer for 5 minutes.
06 - Remove skillet from heat. Add cooked egg noodles and sour cream, blending until contents are evenly combined.
07 - Transfer the entire mixture into a 9x13-inch baking dish, spreading it evenly. Sprinkle shredded cheddar cheese across the surface.
08 - Bake uncovered in preheated oven for 20 to 25 minutes, until the casserole is bubbly and cheese is fully melted.
09 - Remove from oven and garnish with chopped fresh parsley before serving, if desired.