Vegan One-Pot Spaghetti Recipe

Ingredients

• 150 gdiced onion
• 3 clovesgarlic, minced
• 175 gcremini mushrooms, thinly sliced (or about 227 g white button mushrooms)
• 1 mediumyellow or red pepper, diced
• 1 large handful, optionalspinach or other greens
• 12 gfresh basil, roughly chopped
• 15 mlolive oil (or broth or water as needed for an oil-free version)
• 2 jars (680 g each)marinara sauce
• 360 mlwater
• 340 gdry gluten-free spaghetti (or another pasta shape)
• ½ tsp, plus more to tastesea salt
• 1 tspdried oregano or Italian seasoning blend
• ¼ tsp, or to tastecrushed red pepper flakes
• To taste, optionalvegan Parmesan cheese

Instructions

1. 1

   Heat the pot

   Set a large lidded pot over medium heat. When it is hot, add the olive oil and let it warm for about 30 seconds.

2. 2

   Cook the onion

   Add the diced onion and sauté for 4–5 minutes, stirring occasionally, until translucent and lightly browned. Lower the heat if it starts browning too quickly.

3. 3

   Soften the vegetables

   Stir in the garlic, mushrooms, pepper and ½ tsp sea salt. Sauté for 5–7 minutes, stirring frequently, until the vegetables soften and begin to caramelise.

4. 4

   Add the herbs

   Stir in the oregano and red pepper flakes for about 1 minute, until fragrant.

5. 5

   Add pasta and sauce

   Pour in the marinara sauce and 360 ml water, then bring to a gentle simmer. Break the spaghetti in half unless using a smaller pasta shape, add it to the pot and stir thoroughly to separate the strands.

6. 6

   Simmer the pasta

   Add the greens if using. Cover, reduce the heat to low and simmer for 13 minutes, stirring twice during cooking to keep the pasta separated and cook it evenly.

7. 7

   Rest and season

   Turn off the heat and leave the pot covered for 2 minutes. Stir to separate any remaining clumps, then taste and adjust with more salt, oregano or red pepper flakes as preferred.

8. 8

   Garnish and serve

   Top with fresh basil and vegan Parmesan if desired, and serve warm.

What is vegan one-pot spaghetti?

This is a plant-based take on a familiar Italian-inspired pasta supper: spaghetti cooks in the pot with vegetables and tomato sauce rather than in a separate pan. The one-pot approach lets the pasta take on the sauce’s flavour while keeping washing-up to a minimum.

Mushrooms bring savoury depth, pepper adds sweetness, and basil and oregano give the tomato base an aromatic finish. Gluten-free spaghetti makes the dish suitable for a gluten-free pasta choice, though you should check the sauce and other packaged ingredients too.

Nutrition and macros by portion

The nutrition label shows one serving as written: 450 calories, 15g protein, 85g carbs, 8g fat.

Most of the carbohydrates come from the spaghetti and marinara, while the olive oil and any vegan Parmesan contribute most of the fat. The pasta, mushrooms and sauce contribute some protein, though the amount depends on the products used. Pair a serving with a side salad or extra vegetables to add more variety to the plate.

Build the vegetable base

Onion first: Give it 4–5 minutes to soften and turn lightly golden before adding the other vegetables. If it colours too fast, reduce the heat so it does not burn.

Mushrooms and pepper: Frequent stirring during their 5–7-minute sauté helps them soften and start to caramelise. Use a pot large enough to stir them without crowding.

Choose the pasta carefully

Gluten-free spaghetti: Different brands and shapes can cook at different rates, so use the stated 13 minutes as a guide and check the pasta towards the end. Breaking long strands in half helps them fit into the pot and become submerged.

Other shapes: The recipe allows another pasta shape, particularly smaller shapes that do not need breaking. Keep the same cooking method and check the packet guidance and texture as the pasta simmers.

Keep the pasta moving

Stirring: Mix thoroughly when adding the dry pasta, then stir twice during the covered simmer. This helps separate the strands and encourages more even cooking.

Liquid: The sauce and 360 ml water cook together with the pasta. Keep the heat low for the simmer and check that the mixture is not catching on the bottom as you stir.

Check texture and seasoning

Doneness: After 13 minutes, taste a strand to see whether it has reached your preferred texture. If it is still firm, continue cooking and check again; the recipe does not specify an additional cooking time.

Final taste: Letting the pot stand covered for 2 minutes gives the pasta a brief rest before you stir and season. Add extra salt, oregano or chilli flakes only as needed.

Finish with greens and basil

Optional greens: Add spinach or other greens before covering the pot so they wilt as the pasta simmers. They make an easy addition without needing a separate cooking step.

Fresh finish: Stir or scatter roughly chopped basil over the pasta when serving, with vegan Parmesan if you like. The garnishes are optional, so the dish can be adjusted to what you have.

Serve it as a meal

Serve the pasta warm, straight from the pot. For a more balanced plate, add a simple side salad or extra vegetables; bread is another option if you want a heartier meal.

The sauce and pasta make this filling on their own, while the mushrooms, pepper and optional greens bring vegetable variety.

Recipe notes & tips

• Use a large pot so the pasta can be stirred freely as it cooks.
• Stir the pasta well when it first goes into the sauce to help keep the strands separate.
• Keep the simmer gentle and the lid on during cooking.
• Check the pasta near the end, as gluten-free varieties can differ in cooking time.
• Add the optional greens with the sauce and pasta so they wilt in the pot.
• If cooking without oil, use broth or water and add more as needed to prevent sticking.

Variations

• Add greens: Stir spinach or another leafy green into the pot before simmering.
• Change the pasta: Use another pasta shape in place of gluten-free spaghetti.
• Adjust the heat: Increase or reduce the red pepper flakes to suit your preference.
• Swap the mushrooms: Use white button mushrooms instead of cremini.
• Finish with cheese: Sprinkle vegan Parmesan over each serving if desired.

Common mistakes to avoid

• Rushing the onion: Cook it for 4–5 minutes and lower the heat if it browns too quickly.
• Skipping the stir: Mix the pasta in thoroughly at the start and stir twice while it simmers to limit clumping.
• Cooking too vigorously: Keep the heat low once covered so the sauce simmers gently.
• Assuming every pasta cooks alike: Taste towards the end and judge doneness by texture.
• Adding too much seasoning at once: Taste after the rest, then adjust salt, oregano or chilli gradually.

How to store

Refrigerate leftovers for 2–3 days in a covered container. Reheat with a little water if needed to loosen the pasta. Freezing is not recommended because the texture may change.

Frequently asked questions