01 - Set oven to 375°F. Prepare a 9x13-inch baking dish.
02 - Bring water to a boil. Cook egg noodles according to package instructions, then drain and reserve.
03 - In a large skillet over medium heat, brown the ground beef. Drain excess fat from the pan.
04 - Add diced onion, minced garlic, and bell pepper to skillet. Sauté for 3 to 4 minutes, stirring frequently, until vegetables are softened.
05 - Stir in tomato sauce, diced tomatoes with their juices, beef broth, oregano, basil, salt, and black pepper. Simmer on medium-low heat for 5 minutes.
06 - Remove pan from heat. Add cooked egg noodles and sour cream. Mix until noodles are evenly coated with sauce.
07 - Spread mixture evenly into prepared baking dish. Sprinkle shredded cheddar cheese over the surface.
08 - Place dish in preheated oven and bake uncovered for 20 to 25 minutes, until cheese is melted and casserole is bubbly.
09 - Remove from oven and let stand briefly. Garnish with chopped fresh parsley prior to serving, if desired.