Family Tested & Approved
Preheat oven to 375 degrees Fahrenheit. Prepare pasta according to package directions, set aside. Drain water from macaroni and lightly toss in margarine.
Add onions, garlic, spinach, cooked pasta and tuna, mixing gently to combine. Spoon the tuna mixture into a 2 quart ovenproof casserole dish and top with the cheeses and milk.
Bake for 35 minutes or until crust is golden brown.