Preheat oven to 350 degrees. Cook pasta according to package directions; drain. In medium skillet cook onion in 1 tablespoon butter over medium heat about 5 minutes or until tender, stirring occasionally. Remove from heat and set aside.

In bowl, whisk together eggs, milk, Italian seasoning, salt & pepper to taste, crushed red pepper. Stir in chicken, cheese, artichokes, spinach, sun-dried tomatoes, half of the Parmesan, cooked pasta, and onion. Spoon into a 13 x 9 dish sprayed with Pam.

Bake, covered, 20 minutes. In small bowl, combine remaining Parmesan, bread crumbs, paprika and melted butter. Sprinkle over pasta. Bake, uncovered, about 20 minutes more until hot and golden.