Boil the Penne. Be sure to boil the pasta properly and drain.
Add the tuna, and the rest of the ingredients, egg, chadon beni, paprika etc. Toss the ingredients lightly and add the grated cheddar cheese.
Mix well before placing in the oven. Pour in a casserole dish and top with grated Parmesan cheese and Panko bread crumbs.
Bake for about 30 minutes or until golden in a 350 degrees F oven. Remove and serve cool.