Cook noodles per instructions on package, drain and set back in pot.
In a large skillet, melt 1 TBS butter on medium high. Add diced celery and onion. Saute 2-3 minutes until onion is softened. Add minced garlic and cook for 30 seconds.
Add remaining 3 TBS of butter and add the flour. Continually mix for 1-2 minutes.
Slowly add in the chicken broth and milk. Season with salt and pepper. Stir until sauce thickens.
Mix in the tuna and peas.
Pour mixture into the pasta and mix well. Add in parmaesan cheese and mix.
Pour mixture into a 9 x 13 baking dish that was prepared with cooking spray. Smooth out.
Sprinkle chedder cheese evenly on top.
Mix together panko crumbs and 3 TBS butter and sprinkle all over casserole.
Bake at 350 degrees for 25 -30 minutes until crumb topping is golden brown and casserole mixture is bubbly. Enjoy.