Gluten free Tuna Noodle Casserole recipe

So, I didn't have any Gluten free condensed soup on hand, so I googled a recipe for tuna noodle from scratch, and came up with this one.
I made a few modifications, to make it Gluten free, and less hassle.
And It occurred to me, that all of the ingredients are from Costco.

One Package noodles, Goldbaum's Brown Rice, Penne, Gluten free, from Costco
4 oz butter
1/4 cup Flour, Bob's red mill, from Costco
1 1/2 cups milk
12 oz of tuna
2 slices, bread, heal pieces, Udi's from Costco
1 cup shredded cheese

-Cook noodles, per package.
-In medium saucepan, melt butter, over low heat, then whisk in flour, one Tablespoon at a time. Then whisk in Milk, slowly. Keep whisking for 4 min. Then add salt, pepper, garlic powder, onion powder, to taste.
-Mix sauce, noodles, and tuna together. Pour into 9X13 baking pan.
-Top with bread crumbs, and cheese.
-Bake ay 375, for 8-10 min.