Tuna Casserole

I made a pan of tuna casserole about 8x10 or so. Here is what I did.
First I boiled some egg noodles.
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While that was cooking I made a roux.
4 T. olive oil
4 T. flour
3-4 c. milk
make like you are making gravy.
Add salt, pepper and celery salt. I also added about 1/2 c. shredded cheese.
Edited to add: I just read a recipe about making this and she used onion, garlic salt and celery ribs chopped fine.
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I didn't have any frozen peas so I opened two cans and drained one and added about 2/3 of one can to the roux.
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Then I opened and drained two cans of tuna and added that to the roux.
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When the noodles were done I drained them and mixed them with the roux in a mixing bowl. Then I put them in my baking pan and topped with more shredded cheese.
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Its baking now at 350 degrees. I will bake it until the cheese melts and its bubbly.