
The best classic tuna noodle casserole starts with a homemade sauce from scratch. This one is deliciously cheesy, creamy, and easy with no soup from a can.
Melt the butter in a medium saucepan or skillet over medium heat. Add the flour and stir together until combined. Continue stirring until the mixture becomes golden and fragrant, about 4-5 minutes. Add the shallot or onion and bay leaves, stirring and cooking until the onion softens and releases moisture and loosens the roux, about 3 minutes.
Preheat the oven to 375°F. Bring a large pot of water to a boil and cook the pasta until al dente and still chewy, about 2 minutes less cooking time than the package directions. Before draining, reserve 1 cup of pasta water. Drain the pasta.