01 - Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish with cooking spray or butter.
02 - Bring a large pot of salted water to a boil. Cook egg noodles according to package instructions until al dente. Drain thoroughly and set aside.
03 - Heat olive oil in a large skillet over medium heat. Add diced onions and red bell pepper (if using). Sauté for 3–4 minutes until vegetables are softened and fragrant.
04 - Add ground beef to the skillet, breaking it apart with a spatula. Cook until thoroughly browned and no pink remains. Drain excess fat from the pan.
05 - Stir in minced garlic and cook for 1 minute until aromatic. Add tomato paste, drained diced tomatoes, frozen peas (if using), dried Italian herbs, paprika, salt, and black pepper. Continue cooking for 3–4 minutes to meld flavors.
06 - Remove skillet from heat. Stir in sour cream and condensed cream of mushroom soup until the mixture is uniform and well combined.
07 - Gently fold in half of the shredded cheddar cheese and the cooked egg noodles until evenly distributed throughout the beef mixture.
08 - Transfer the entire mixture to the prepared baking dish, spreading it into an even layer. Sprinkle the remaining cheddar cheese uniformly over the top.
09 - Bake uncovered for 25–30 minutes until the cheese is melted, golden, and bubbling. Remove from oven and let rest for 5 minutes before serving to allow flavors to settle.