Preheat oven to 375 and spray a casserole with cooking spray or wipe with olive oil.
Cook gnocchi according to package directions in salted water.
Melt butter in a saucepan over medium high heat and whisk in flour. Whisk in milk and simmer until the mixture starts to thicken, about about 5 minutes.
Stir in cheese until melted. Add cooked gnocchi and stir until coated.
Transfer gnocchi mixture to your casserole and bake until golden, about 20-30 minutes. If you like, you can turn on the broiler for a minute or two at the end to crisp the top.
Serve in your favorite bowls to your favorite people. Feel better.