Start water boiling for pasta. When boiling add pasta to cook
If any of your seafood is raw cook it in 1 TBS butter once almost cooked through add the rest of the seafood and a sprinkling of Old Bay seasoning to taste. Remove from pan.
Using the same pan add remaining butter over medium heat and flour to make a roux.
Slowly add milk while stirring to make a cream sauce.
Add cheese and melt though.
Add seafood mix.
Add salt and onion powder to taste.
Next add 1/8 to 1/4 C pasta water and pasta reserving water in case you want it thinner.
You can serve it now as a saucy pasta but what I think makes this special is this next step. Pour into casserole dish. Cover generously with Panko breadcrumbs. Spray with Pam and broil until crisp.