Creamy Spinach Pasta Bake

Ingredients

• 450 g (1 lb)short pasta, such as penne, rigatoni, ziti or fusilli
• 56 g (4 tablespoons)unsalted butter
• 1 mediumyellow onion, finely chopped
• 4 clovesgarlic, minced
• 30 g (¼ cup)plain flour
• 710 ml (3 cups)whole milk
• 240 ml (1 cup)double cream
• 280 g (10 oz)fresh spinach, roughly chopped
• 75 g (¾ cup), dividedgrated Parmesan
• 225 g (2 cups), dividedshredded mozzarella
• 1½ teaspoons, or to tastesalt
• 1 teaspoonfreshly ground black pepper
• ¼ teaspoonfreshly grated nutmeg

Instructions

1. 1

   Prepare the oven

   Heat the oven to 190°C (375°F). Lightly grease a 23 × 33 cm baking dish, or another dish with a capacity of about 3 quarts.

2. 2

   Cook the pasta

   Bring a large pan of well-salted water to a rolling boil. Cook the pasta according to the packet instructions, stopping about 2 minutes early so it remains very al dente. Drain well and set aside.

3. 3

   Soften the aromatics

   While the pasta cooks, melt the 56 g of butter in a large, heavy-based pan over medium heat. Add the onion and cook for 5–7 minutes, stirring occasionally, until soft and translucent. Stir in the garlic and cook for 1 minute without letting it brown.

4. 4

   Cook the roux

   Sprinkle the 30 g of flour over the onion and garlic. Whisk continuously for 1–2 minutes, until the mixture forms a thick, bubbling paste.

5. 5

   Thicken the sauce

   Gradually whisk in the 710 ml of milk, adding about 120 ml at a time. Once all the milk is incorporated, cook for 5–8 minutes, stirring frequently, until the sauce thickens enough to coat the back of a spoon.

6. 6

   Melt in cheese

   Turn the heat to low and stir in the 240 ml of double cream. Add half of the mozzarella, about 110 g, and half of the Parmesan, about 38 g. Stir gently until the cheese has melted and the sauce is smooth.

7. 7

   Season and wilt

   Stir in the salt, black pepper and nutmeg, tasting and adjusting the seasoning if needed. Add the chopped spinach and stir it through the hot sauce until wilted, which should take a couple of minutes.

8. 8

   Coat the pasta

   Add the drained pasta to the pan and stir gently but thoroughly so each piece is coated in the spinach sauce.

9. 9

   Fill the dish

   Transfer the pasta mixture to the prepared baking dish and spread it into an even layer. Scatter the remaining mozzarella and Parmesan over the top.

10. 10

    Bake until golden

    Bake uncovered for 20–25 minutes, until the sauce bubbles around the edges and the topping is melted, golden and crisp in places. For a more deeply browned top, grill for the final 1–2 minutes, watching closely.

11. 11

    Rest before serving

    Set the dish on a wire rack and leave it to rest for at least 10–15 minutes before serving warm.

What is a creamy spinach pasta bake?

A pasta bake is a casserole of cooked pasta and sauce finished in the oven, where the top can turn golden while the centre stays tender. This version pairs the familiar cheese-topped format with a béchamel-style sauce and spinach.

The method draws on the European tradition of thickened milk sauces, while the short pasta and melted cheese make it a familiar home-style bake. Undercooking the pasta and letting the sauce thicken before baking help it stay creamy rather than soft and watery.

Nutrition and macros by portion

The nutrition label shows one serving as written: 580 calories, 0g protein, 0g carbs, 0g fat.

The pasta supplies most of the carbohydrates, while butter, double cream and cheese contribute much of the fat. Milk, mozzarella and Parmesan provide protein, with spinach adding some as well. Pair a portion with a crisp salad or green vegetables for a fresh contrast.

Why short pasta works

Pasta shape: Penne, rigatoni, ziti and fusilli all have ridges, hollows or curves that catch the thick sauce. Choose a shape that can hold up through both boiling and baking.

Starting point: Cook the pasta about 2 minutes less than the packet suggests. It will finish cooking in the oven as it takes up some of the sauce.

Building a smooth sauce

Roux: Whisk the flour into the butter and softened aromatics, then cook it for 1–2 minutes. This cooks out the raw flour taste and gives the sauce its thickening base.

Milk: Add the milk gradually while whisking so it blends evenly into the roux. Give the sauce 5–8 minutes to thicken before adding the cream and cheese.

Getting the spinach and seasoning right

Spinach: Add the roughly chopped leaves to the hot sauce and stir until they wilt. They take up much less space once cooked, so keep stirring rather than adding extra liquid.

Seasoning: Parmesan brings saltiness, while pepper and a small amount of nutmeg round out the creamy sauce. Taste before adding more salt, especially if your cheese is particularly salty.

The bake and its texture

Before baking: Spread the pasta evenly in the dish and distribute the remaining cheese over the top. An even layer helps the topping brown at a similar rate.

Doneness: Look for bubbling sauce at the edges and melted, golden cheese on top. Resting the bake for 10–15 minutes helps the sauce settle so portions are easier to serve.

What to serve alongside

A crisp green salad or simply dressed leaves offer a fresh contrast to the rich sauce. Steamed green vegetables also work well if you want a warm side.

Serve the bake straight from the dish after its resting time. The cheese topping and spinach sauce already make it substantial, so a light side is usually enough.

Recipe notes & tips

• Salt the pasta water well, since the pasta itself is not seasoned later.
• Keep the pasta very al dente so it does not become soft during baking.
• Whisk as you add the milk, especially at the beginning, to help keep the sauce smooth.
• Use freshly grated Parmesan for a sauce that melts evenly.
• Watch the dish closely if you grill the top, as the cheese can brown quickly.
• Allow the bake to rest for at least 10–15 minutes before portioning.

Variations

• Add mushrooms: Cook sliced mushrooms with the onion until their moisture has evaporated.
• Use another pasta shape: Choose a short shape such as shells or macaroni that holds the sauce.
• Add chilli: Stir a pinch of chilli flakes into the sauce with the garlic.
• Change the cheese: Replace some of the mozzarella with mature cheddar for a sharper flavour.
• Use frozen spinach: Thaw it and squeeze out excess water before stirring it into the sauce.

Common mistakes to avoid

• Overcooking the pasta: Stop about 2 minutes before the packet time so it keeps its shape in the oven.
• Adding milk too quickly: Pour it in gradually while whisking to avoid lumps.
• Browning the garlic: Cook it for just 1 minute after the onion, then move straight on to the flour.
• Skipping the sauce-thickening step: Cook it until it coats a spoon before adding the pasta.
• Serving immediately: Rest the bake for 10–15 minutes so the sauce can settle.
• Walking away from the grill: Check the topping closely during the final 1–2 minutes to prevent burning.

How to store

Cool leftovers, cover them and refrigerate for up to 3 days. Reheat portions in the oven or microwave until piping hot; add a small splash of milk if the sauce has thickened in storage.

Frequently asked questions