01 - Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish with cooking spray or a small amount of oil.
02 - Cook egg noodles according to package instructions until al dente. Drain thoroughly in a colander and set aside.
03 - In a large skillet, heat olive oil over medium heat. Add diced onions and red bell pepper (if using); sauté for 3-4 minutes until softened and translucent.
04 - Add ground beef to the skillet and cook until browned, breaking up with a spatula as it cooks. Drain excess fat from the pan.
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. Cook for 3-4 more minutes to combine flavors.
06 - Remove the skillet from heat. Mix in sour cream and condensed cream of mushroom soup until fully incorporated and smooth.
07 - Fold in half of the shredded cheddar cheese and the cooked egg noodles, stirring gently to distribute evenly.
08 - Transfer the entire 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 casserole is bubbly around the edges. Let rest for 5 minutes before serving to set.