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The filling should settle into the dish like a thick, creamy sauce, not run across the bottom when you scoop it. That’s what gives this tuna pot pie its cozy, spoonable center beneath a puffed golden lid. I like how the pastry turns a few familiar pantry ingredients into a proper baked dinner without asking you to make a separate crust.

Here, the vegetables soften in butter before flour thickens the broth and milk into a smooth base. Frozen peas and drained tuna go in at the end, so they stay intact rather than disappearing into the sauce. A single sheet of puff pastry covers the filling, with a few vents to let steam escape as it bakes. After a short rest, each serving has tender vegetables, flakes of tuna, and crisp pastry on top.

Why Tuna Pot Pie Works Better With a Top Crust Only

A bottom crust sounds like the natural choice for pot pie, but this filling is creamy and moist. Puff pastry pressed beneath it would sit directly against that sauce, where it’s likely to turn soft rather than develop the crisp, flaky layers you want. One pastry lid puts the crisp part where it can puff and brown, while the filling stays tender underneath.

That single sheet also makes the finishing work straightforward: lay it over the filled dish, trim it with a little overhang, then tuck the edges against the inside rim. The pastry doesn’t need to seal the dish airtight. Four small vents give steam a way out, and you’ll see the filling bubbling through them when the pie is ready.

There’s a nice contrast in every serving: the top is light and crisp, while the tuna and vegetables stay held in a soft sauce. It’s a better match for puff pastry than trying to build a bottom layer that can’t stay flaky in contact with the filling.

What the Tuna, Sauce, and Pastry Each Bring to the Pie

• Tuna packed in water — It brings a clean, savory taste without adding extra oil to the creamy sauce. Drain it well, then fold it in gently so the flakes remain distinct. Tuna packed in oil also works; drain it thoroughly for a richer filling.
• All-purpose flour — Cooking the flour briefly in the melted butter gives the sauce its body and helps prevent a raw flour taste. For a gluten-free version, use a measure-for-measure gluten-free flour blend in the same quantity and pair it with gluten-free puff pastry.
• Whole milk and chicken broth — Milk makes the sauce creamy, while broth gives it a savory base. Lower-fat milk can work, but the sauce will be a little less rich. Choose a broth you like the taste of; its savory notes come through in the finished filling.
• Frozen peas — Their small, sweet bites break up the richness. Stir them in while still frozen; there’s no need to thaw them first. If peas aren’t your thing, leave them out for a simpler tuna-and-carrot filling.
• Puff pastry — The frozen sheet creates the crisp, airy lid without mixing or rolling pie dough. Thaw it until it unfolds without cracking, but handle it while it’s still cool; pastry that has become warm and sticky is harder to fit neatly over the dish.
• Unsalted butter — It starts the vegetable base and gives the flour a chance to cook before the liquids go in. If salted butter is what you have, use it in its place and omit the kosher salt, then season to taste.

Building the Filling and Fitting the Pastry Lid

Soften the Carrots and Onion

Heat the oven to 400°F and lightly grease a 2-quart baking dish. Melt the butter in a large saucepan over medium heat, then add the finely chopped onion and diced carrots. Cook for 5–7 minutes, stirring occasionally, until the vegetables have softened. If the onion starts browning before the carrots soften, lower the heat so the butter doesn’t scorch.

Turn the Butter and Flour Into a Smooth Sauce

Stir the flour into the softened vegetables and cook it for 1 minute. Gradually whisk in the chicken broth and whole milk; adding the liquids in stages helps the flour blend in rather than forming stubborn lumps. Stir in the salt, pepper, and dried thyme, then simmer for 3–5 minutes, stirring, until the sauce thickens. Keep stirring across the bottom of the pan so the sauce doesn’t catch.

Fold in the Tuna and Peas

Once the sauce has thickened, gently stir in the frozen peas and drained tuna. A light hand keeps the tuna from breaking down into tiny pieces and gives the finished filling a more satisfying texture. Transfer everything to the prepared baking dish and spread it into an even layer. The filling should be contained below the rim so it has room to bubble without spilling over.

Fit the Pastry and Bake Until Golden

Lay the thawed puff pastry over the filling and trim it to fit, leaving about a 1-inch overhang. Tuck the edges against the inside rim of the dish, then cut 4 small vents in the top. Bake for 25–30 minutes, until the pastry is puffed and golden and the filling bubbles through the vents. Let the pie rest before serving; the Kitchen Note above explains why the full 10 minutes is worth it.

Three Practical Ways to Adapt Tuna Pot Pie

Questions That Come Up When Making Tuna Pot Pie

Tuna Pot Pie

Tuna pot pie pairs a creamy tuna and vegetable filling with a puff pastry topping baked until puffed and golden. The filling bubbles through the vents, and a 10-minute rest helps it settle before serving.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 39 minutes mins

resting 10 minutes mins

Total Time 1 hour hr 4 minutes mins

Servings: 6 servings

Course: Dinner

Cuisine: American

Calories: 334

Ingredients Equipment Method Notes

Ingredients

  

For the filling

• 4 tbsp unsalted butter
• 1 cup yellow onion finely chopped
• 1 cup carrots cut into 1/4-inch dice
• 0.33 cup all-purpose flour
• 1.5 cup low-sodium chicken broth
• 1 cup whole milk
• 0.5 tsp kosher salt
• 0.25 tsp black pepper
• 0.5 tsp dried thyme
• 1 cup frozen peas
• 2 can (5 oz) tuna packed in water, drained

For the topping

• 1 sheet (about 8 oz) puff pastry frozen, thawed

Equipment

• 1 2-quart baking dish

Method

 

Make the filling

1. Heat the oven to 400°F.
2. Lightly grease a 2-quart baking dish.
3. Melt the butter in a large saucepan over medium heat.
4. Add the onion and carrots and cook for 5–7 minutes, stirring occasionally, until softened.
5. Stir in the flour and cook for 1 minute.
6. Gradually whisk in the broth and milk, then add the salt, pepper, and thyme.
7. Simmer for 3–5 minutes, stirring, until thickened.
8. Gently stir in the peas and drained tuna.
9. Transfer the filling to the prepared baking dish.

Top and bake

1. Lay the puff pastry over the filling and trim it to fit with about a 1-inch overhang.
2. Tuck the edges against the inside rim of the dish.
3. Cut 4 small vents in the top.
4. Bake for 25–30 minutes, until the pastry is puffed and golden and the filling bubbles through the vents.
5. Rest for 10 minutes before serving.

Notes

For a crisp topping, keep the thawed puff pastry cold until you place it over the filling. Refrigerate leftovers for up to 3 days; freezing is possible, though the pastry may lose some crispness. For a dairy-free variation, use plant-based butter and unsweetened non-dairy milk.