Preheat oven to 375°F (190°C). Lightly grease a deep, medium-sized casserole dish.

Cook egg noodles according to package directions. Drain and set aside. While noodles cook, brown ground beef in a skillet over medium heat. Drain excess fat, then stir in tomato sauce and season with salt and pepper to taste.

In a separate medium bowl, combine the softened cream cheese, sour cream, chopped green onion, chopped bell pepper, and dried tarragon until well mixed.

Spread half of the cooked noodles evenly in the prepared casserole dish. Top with half of the beef and tomato sauce mixture. Dollop or spread half of the cream cheese mixture over the beef layer. Repeat with the remaining noodles, beef mixture, and cream cheese mixture.

Cover the casserole dish tightly with foil and bake for 30 minutes at 375°F (190°C), or until heated through and bubbly. For an extra-golden top, remove foil for the last 5 minutes of baking.