01 - Set oven temperature to 375°F and allow it to fully preheat.
02 - Prepare egg noodles according to package directions in lightly salted boiling water, then drain well and set aside.
03 - In a large skillet over medium heat, break up and cook ground beef until fully browned. Drain excess fat from the skillet.
04 - Add diced onion, minced garlic, and diced bell pepper to skillet with beef. Sauté for 3 to 4 minutes, stirring occasionally, until vegetables are tender.
05 - Stir in tomato sauce, diced tomatoes with their juices, beef broth, dried oregano, dried basil, salt, and black pepper. Bring to a simmer and cook for 5 minutes.
06 - Remove skillet from heat. Add cooked noodles and sour cream, stirring gently to combine completely.
07 - Spoon mixture into a 9x13-inch baking dish, spreading evenly. Sprinkle shredded cheddar cheese across the surface.
08 - Place uncovered dish in oven and bake for 20 to 25 minutes, or until casserole is bubbling and cheddar is fully melted.
09 - Remove from oven and let stand a few minutes. Garnish with fresh chopped parsley before serving if desired.