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 boil. Cook egg noodles according to package directions until al dente, approximately 7-8 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; sauté for 3-4 minutes until vegetables begin to soften and onion becomes translucent.
04 - Add ground beef to the skillet. Cook, breaking up meat with a spatula, until browned completely, approximately 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, Italian herbs, paprika, salt, and pepper. Continue cooking for 3-4 minutes to meld flavors.
06 - Remove skillet from heat. Mix in sour cream and cream of mushroom soup until fully incorporated into the beef mixture.
07 - Fold in half of the shredded cheddar cheese and the cooked noodles. Transfer mixture to the prepared baking dish. Spread evenly and top with remaining cheddar cheese.
08 - Bake for 25-30 minutes until cheese is melted and bubbly with golden-brown spots on top. Remove from oven and let rest for 5 minutes before serving to allow casserole to set.