Tuna Green Bean Casserole

Green Beans Casserole
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Prep: 15 mins
Cook: 35 mins
Total: 50 mins
Servings: 4 to 6 servings
Yield: 1 casserole
Nutrition Facts (per serving)
169 Calories
7g Fat
8g Carbs
18g Protein
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Nutrition Facts
Servings: 4 to 6
Amount per serving
Calories 169
% Daily Value*
Total Fat 7g 9%
Saturated Fat 4g 18%
Cholesterol 42mg 14%
Sodium 490mg 21%
Total Carbohydrate 8g 3%
Dietary Fiber 1g 3%
Total Sugars 4g
Protein 18g
Vitamin C 3mg 17%
Calcium 91mg 7%
Iron 1mg 7%
Potassium 314mg 7%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

This simple tuna and vegetable casserole comes together with a simple white sauce. Frozen cooked green beans, tuna, and diced celery make a tasty casserole with relatively few carbs. If you aren't counting carbs, serve the casserole with some hot cooked rice or noodles.

Canned or fresh sauteed mushrooms are another possibility for extra flavor and texture. For an all-in-one casserole, spread a layer of cooked rice—about 1 1/2 to 2 cups—in the prepared baking dish before you add the tuna and green bean mixture.

Top the casserole off with some crumbled french fried onions if you'd like, or sprinkle about 1/2 cup of buttered breadcrumbs over the top before it goes into the oven.


  • 2 tablespoons unsalted butter

  • 3 tablespoons all-purpose flour

  • 1/2 teaspoon salt

  • 1/4 teaspoon freshly ground black pepper

  • 1 1/3 cups milk

  • 2 (7-ounce) cans tuna, drained, juice reserved

  • 1/2 teaspoon dried thyme

  • 1/2 cup finely diced celery

  • 1 1/2 cups green beans, fresh or frozen, cooked

Steps to Make It

  1. Heat the oven to 350 F. 

  2. Lightly butter a 1 1/2-quart baking dish (11 x 7-inch baking pan or 8-inch-square baking dish).

  3. In a medium saucepan, heat 2 tablespoons of butter; blend in the flour, salt, and pepper. Stir until smooth. Continue to cook for 2 minutes while stirring constantly.

  4. Gradually add the milk and continue to cook until thickened, stirring constantly.

  5. Add the dried thyme, tuna, reserved juice from the tuna, celery, and green beans; mix well.

  6. Transfer the tuna and green beans to the prepared baking dish and bake for 25 to 30 minutes.

  7. Serve the casserole with hot cooked rice or noodles, if desired.