01 - Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish with cooking spray or a small amount of oil.
02 - Bring a large pot of salted water to a boil. Add egg noodles and cook according to package directions until al dente, typically 6-8 minutes. Drain thoroughly in a colander and set aside.
03 - Heat olive oil in a large skillet over medium heat. Add diced onion and red bell pepper (if using) and sauté for 3-4 minutes until softened and translucent.
04 - Add ground beef to the skillet. Cook, breaking up with a spatula, until fully browned and no longer pink, about 6-8 minutes. Drain excess fat from the skillet.
05 - Stir in minced garlic and cook for 1 minute until fragrant. Add tomato paste, drained diced tomatoes, frozen peas (if using), Italian herbs, paprika, salt, and pepper. Continue cooking for 3-4 minutes to meld the flavors.
06 - Remove skillet from heat. Mix in sour cream and cream of mushroom soup until fully incorporated and smooth.
07 - Add half of the shredded cheddar cheese and the cooked egg noodles to the meat mixture. Fold together gently until evenly combined.
08 - Transfer the mixture to the prepared baking dish, spreading evenly. Top with the remaining shredded cheddar cheese in a uniform layer.
09 - Bake for 25-30 minutes until the cheese is melted and golden brown, and the edges are bubbling. Allow to rest for 5 minutes before serving to set.