All In One Tuna Casserole 1 package dry onion soup mix 1 1/2 cups milk 1 (15.25 ounce) can mixed vegetables, drained 8 ounces medium egg noodles, cooked, drained 1 (6.5 ounce) can tuna, drained, flaked 1/2 cup shredded cheddar cheese Preheat oven to 350. In bowl, combine soup mix and milk. Stir in vegetables, noodles and tuna. Spoon into greased 2 quart baking dish. Sprinkle with cheese. Bake for 20 minutes.