Beef and Cheddar Casserole

INGREDIENTS

• 3 cups wide egg noodles (about 5 ounces)
• Kosher salt
• 1 1/2 cups sour cream
• 2 cups grated Cheddar
• 1 tablespoon tomato paste
• 1 teaspoon Italian seasoning
• 1 red bell pepper, seeded and chopped
• 1 tablespoon extra-virgin olive oil, plus more for the baking dish
• 12 ounces ground beef
• One 14 1/2-ounce can petite diced tomatoes
• 1/2 cup freshly grated Parmesan
• 1 bunch scallions (white and green parts), finely chopped