Tuna Sandwich Casserole

Transform your classic sandwich into a warm and comforting one-dish meal with this irresistible Tuna Sandwich Casserole. Packed with flaky canned tuna, creamy mayonnaise, crunchy celery, and savory onions, this recipe reimagines tuna salad in oven-baked form. Layers of buttery, cubed sandwich bread soak up the rich flavors, while gooey cheddar cheese adds a perfect, golden topping. With a dash of dried parsley and a hint of black pepper for added zest, this hearty casserole is quick to prepare and ready in under 40 minutes—ideal for busy weeknights or casual family dinners. Serve it bubbling hot straight from the oven for a nostalgic dish that turns pantry staples into a crowd-pleasing comfort food classic!

Nutriscore Rating: 57/100

Prep Time:15 mins

Cook Time:25 mins

Total Time:40 mins

Servings: 4

Ingredients

• 12 oz canned tuna
• 1 cup mayonnaise
• 1 cup celery
• 0.5 cup onion
• 2 cups cheddar cheese
• 6 slices white or wheat sandwich bread
• 2 tablespoons butter
• 0.5 cup milk
• 0.5 teaspoon salt
• 0.25 teaspoon black pepper
• 1 teaspoon dried parsley

Directions

Step 1

Preheat your oven to 375°F (190°C) and lightly grease a medium-sized baking dish.

Step 2

Drain the canned tuna thoroughly and flake it into a large mixing bowl.

Step 3

Add the mayonnaise, diced celery, diced onion, salt, black pepper, and dried parsley to the bowl with the tuna. Stir until fully combined.

Step 4

Butter one side of each sandwich bread slice. Cut the slices into cubes and set aside.

Step 5

In a small saucepan, heat the milk over low heat, stirring occasionally, until warm (but not boiling).

Step 6

Sprinkle 1 cup of shredded cheddar cheese into the tuna mixture and fold gently. Add the warmed milk to the mixture and stir to combine.

Step 7

Add half of the bread cubes to the bottom of the prepared baking dish. Spread the tuna mixture evenly on top of the bread layer.

Step 8

Layer the remaining bread cubes on top of the tuna mixture.

Step 9

Sprinkle the top with the remaining 1 cup of shredded cheddar cheese.

Step 10

Bake in the preheated oven for 20-25 minutes or until the top is golden brown and cheese is melted.

Step 11

Remove the casserole from the oven and let it rest for 5 minutes before serving. Enjoy!

Nutrition Facts

Serving size	1253.3 grams (1253.3g)

Amount per serving	% Daily Value*
Calories	3804

Total Fat 272.90g	350%
Saturated Fat 70.30g	351%
Polyunsaturated Fat 0.80g
Cholesterol 620mg	207%
Sodium 5604mg	244%
Total Carbohydrate 169.30g	62%
Dietary Fiber 5.30g	19%
Total Sugars 21.60g
Protein 155.20g	310%

Vitamin D 330IU	1652%
Calcium 1385mg	107%
Iron 9mg	51%
Potassium 1801mg	38%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 65.4%

Protein: 16.5%

Carbs: 18.0%