Cook pasta shells according to package directions. Rinse in cold water and drain. Spray a medium skillet with nonstick spray coating. Add mushrooms and onion, cook until tender. Stir in parsley, Italian seasoning, and paprika. Cool slightly. Mash the panir in a bowl. Stir in egg white, parmesan cheese, and mushroom and onion mixture. Stuff each manicotti shell with about 1/4 cup of the panir mixture. Arrange stuffed shells in a 12x7-1/2x2-inch baking dish. For sauce, in a medium saucepan combine milk, flour, garlic powder, salt, and pepper. Cook and stir until thickened and bubbly. Pour sauce over pasta in baking dish. Bake, covered, in a 350º F. oven for 20 to 25 minutes or until heated through. Sprinkle with cheddar cheese. Bake uncovered for 2 minutes more or until cheese is melted.
Makes 4 servings.