Combine first 4 ingredients in a medium bowl; beat at high speed of a mixer until well-blended. Stir in onion, bell pepper, and 1/4 cup parsley; set aside.
Melt the margarine in a medium saucepan over medium heat. Add flour, and cook 1 minute, stirring constantly with a wire whisk. Gradually add milk and broth, stirring constantly. Bring to a boil over medium heat, and cook 3 minutes or until thickened, stirring constantly. Stir in poultry seasoning, salt, pepper, and garlic powder. Remove from heat; set sauce aside.
Arrange 3 noodles in bottom of a 13 x 9-inch baking dish coated with cooking spray; top with half of cottage cheese mixture, half of chicken, and half of sauce. Repeat layers, ending with sauce.
Combine breadcrumbs, 2 tablespoons parsley, and paprika; sprinkle over casserole. Bake, uncovered, at 375° for 30 minutes. Serve immediately.