Instant Pot Thai Chicken Soup with Coconut Milk

Instant Pot Thai chicken soup is a coconut-rich, aromatic soup inspired by the balance of spicy, savory, tangy, and lightly sweet flavors found in many Thai dishes. Tender chicken, red curry paste, mushrooms, lime, and herbs make a satisfying broth, while rice noodles turn it into a complete meal. Thai soups vary by region and household; this practical pressure-cooker version is designed for an easy weeknight dinner.

Ingredients

1½ lb boneless, skinless chicken thighs (680 g)
1 tbsp neutral oil, such as canola (15 ml)
1 medium yellow onion, thinly sliced (about 150 g)
3 garlic cloves, minced (about 9 g)
1 tbsp finely grated fresh ginger (6 g); galangal is a traditional alternative if available
2 tbsp Thai red curry paste (about 30 g), or more to taste
1 stalk lemongrass, bruised and cut into 3-inch pieces (about 25 g)
4 cups low-sodium chicken broth (946 ml)
1 tbsp fish sauce (15 ml)
1 tsp packed light brown sugar (4 g)
½ tsp kosher salt (about 2 g), plus more to taste
¼ tsp ground black pepper (about 0.5 g)
8 oz cremini or button mushrooms, sliced (225 g)
1 can full-fat coconut milk, well shaken (13.5 oz/400 ml)
4 oz dried rice noodles (115 g), cooked separately according to package directions
2 cups baby spinach (about 60 g)
2 tbsp fresh lime juice (30 ml), plus lime wedges for serving
½ cup chopped fresh cilantro (about 15 g)
2 green onions, thinly sliced (about 30 g)
Thinly sliced fresh red chili, optional (about 1 small chili/10 g)

Instructions

Prepare the ingredients. Slice the onion and mushrooms, mince the garlic, grate the ginger, and cut the lemongrass into manageable pieces. Bruise the lemongrass by pressing it firmly with the flat side of a knife; this helps release its aroma. Keep the chicken refrigerated while you prepare the vegetables, and have the broth measured before starting the cooker.
Build the aromatic base. Select Sauté on the Instant Pot and set it to Normal. Add the oil. When it is shimmering, add the onion and cook for about 3 minutes, stirring until it begins to soften. Add the garlic, ginger, and curry paste and stir for 30 seconds. This brief cooking wakes up the aromatics without letting the garlic scorch. If the mixture sticks, turn off Sauté and add a small splash of broth.
Add the chicken and broth. Pour in about ½ cup (120 ml) of the broth and scrape the bottom of the pot thoroughly with a wooden spoon to loosen any browned bits. This step helps prevent a burn warning. Add the chicken thighs, remaining broth, fish sauce, brown sugar, salt, pepper, and lemongrass. Stir gently so the chicken is surrounded by liquid, but do not stir coconut milk into the pot at this stage.
Pressure-cook. Lock the lid, set the steam valve to Sealing, and cook at High Pressure for 8 minutes. Allow about 12 minutes for the cooker to come to pressure, though the exact time depends on the model and how cold the ingredients are. When the cooking cycle ends, let the pressure release naturally for 10 minutes, then carefully turn the valve to Venting to release any remaining pressure. Keep your face and hands clear of the steam.
Cook the noodles while the pressure releases. Prepare the rice noodles in a separate saucepan according to the package directions, then drain and rinse them briefly with cool water to stop them from sticking. Noodle thickness varies, so follow the timing on the package rather than relying on a fixed number of minutes. Keeping noodles separate prevents them from soaking up the soup broth during storage.
Check the chicken and shred it. Open the lid and check the thickest part of a thigh with a food thermometer. USDA FSIS guidance sets the safe minimum internal temperature for poultry at 165°F (74°C). If the chicken has not reached that temperature, return the lid and pressure-cook for 1 to 2 more minutes, then check again. Transfer cooked chicken to a plate, shred it with two forks, and discard the lemongrass pieces.
Finish the soup. Select Sauté again. Add the mushrooms and simmer for about 4 minutes, until tender. Stir in the coconut milk and bring the broth back to a gentle simmer for about 2 minutes; avoid a hard boil, which can make the coconut milk look separated. Turn off the heat, return the shredded chicken to the pot, and stir in the spinach and lime juice. The spinach will wilt in about 1 minute. Taste and adjust with more lime, fish sauce, salt, or curry paste.
Serve. Divide the cooked noodles among six bowls and ladle the hot soup over them. Finish with cilantro, green onions, and chili if using. Offer lime wedges at the table so each person can adjust the brightness of their bowl.

Tips

Choose curry paste to suit your heat preference. Red curry paste varies in strength and saltiness from one product to another. Start with 2 tablespoons, taste the finished broth, and add more only after pressure cooking. Curry paste can contain shrimp or other seafood, so check the ingredient label if you are avoiding those ingredients.
Use ginger if galangal is hard to find. Galangal has a sharper, pine-like aroma and is the more traditional choice in many Thai soups. Fresh ginger is a convenient substitute, but gives the broth a warmer, sweeter flavor. The soup will still be aromatic and balanced.
Keep coconut milk out of the pressure-cooking stage. Adding it after pressure cooking reduces the chance of scorching or separation and makes it easier to adjust the broth’s richness. Shake the can well before measuring, since the cream and liquid may separate while stored.
Do not skip the bottom-scraping step. Curry paste and onion can leave browned residue after sautéing. Deglaze with broth and scrape until the pot bottom feels smooth before sealing the lid; stuck bits can trigger the cooker’s burn alert.

Serving Suggestions

Serve the soup hot in deep bowls with noodles underneath, so they stay easy to portion and do not crowd the pressure cooker. Lime wedges, cilantro, sliced green onion, and fresh chili let people tailor the tang and heat at the table. For extra crunch, set out a small dish of chopped roasted peanuts, if appropriate for your guests, or a handful of bean sprouts.

The soup is filling on its own, but it also pairs well with a simple cucumber salad, steamed greens, or a small plate of fresh fruit. If you want a lighter bowl, serve the broth and chicken without noodles and offer rice on the side. Keep extra lime available: a little acidity can make a rich coconut broth taste more lively without adding more salt.

Variations

Make it less spicy: Use 1 tablespoon curry paste and omit the fresh chili. If the finished soup is still too hot, stir in a little extra coconut milk. For a more assertive curry flavor, add paste in small increments after cooking rather than adding a large amount before pressure cooking.

Swap the vegetables or protein: Use sliced shiitake mushrooms instead of cremini, or add sliced bell pepper with the mushrooms. Boneless chicken breasts can replace the thighs; check that the thickest piece reaches 165°F (74°C) and avoid extending the cook time unnecessarily, since breast meat can dry out. For a vegetarian variation, use vegetable broth, omit the chicken and fish sauce, and add firm tofu after pressure cooking. Soy sauce can replace fish sauce in that version, though the broth will have a different, less distinctly savory flavor.

Choose another noodle: Thin rice vermicelli, wider rice noodles, or cooked jasmine rice all work. Prepare rice or noodles separately and put them in bowls just before serving. For a lower-noodle bowl, increase the spinach or add more mushrooms after pressure cooking, then simmer until tender.

Storage and Reheating

For best texture, store the soup and noodles separately in airtight containers. Refrigerate leftovers within 2 hours of cooking; the soup keeps for 3 to 4 days in the refrigerator. If the soup has been sitting out longer than 2 hours, discard it rather than saving it. The coconut broth may look slightly separated when cold, which is normal.

Reheat only the portion you plan to eat in a saucepan over medium heat, stirring occasionally until steaming hot throughout; leftovers should reach 165°F (74°C). A microwave also works: cover loosely, heat in short intervals, and stir between intervals so the soup warms evenly. Add a splash of broth or water if it has thickened. Keep noodles separate until serving, and avoid repeatedly cooling and reheating the whole batch. Freeze the soup without noodles for up to 2 months for best quality, then thaw overnight in the refrigerator and reheat to 165°F (74°C).

Frequently Asked Questions

Can I use frozen chicken?
For the most predictable cooking, thaw the thighs in the refrigerator before making the recipe. Frozen chicken can change the time the pot needs to come to pressure and may cook unevenly when pieces are stuck together. If using frozen chicken, separate the pieces first when possible and always confirm that the thickest part reaches 165°F (74°C) with a thermometer before shredding.

Can I put the rice noodles directly in the Instant Pot?
It is better to cook them separately. Rice noodles soften quickly and continue absorbing liquid as they sit, so cooking them in the soup can leave you with swollen noodles and less broth. Separate cooking also makes leftovers easier to store and reheat without losing the soup’s texture.

Can I make the soup without fish sauce?
Yes. For a seafood-free alternative, leave it out and season with soy sauce or tamari to taste. These substitutes bring a different, more bean-like savory quality and may be saltier, so begin with less and adjust at the end. Check the curry paste label as well, because some pastes contain shrimp.

Why does my coconut milk look grainy or separated?
Coconut milk can separate when it is boiled vigorously, and some separation after refrigeration is also common. Keep the finished soup at a gentle simmer rather than a rolling boil, and stir it well while reheating. A slight change in appearance does not necessarily mean the soup has spoiled; use the storage time and smell, and discard it if you are unsure.

Can I prepare any part of the soup ahead?
Yes. Slice the onion and mushrooms, mince the garlic, and portion the seasonings up to a day ahead, storing them covered in the refrigerator. You can also cook the soup in advance, but keep the noodles separate and add fresh lime and herbs when serving. Reheat leftovers to 165°F (74°C).

How can I make the broth more tangy or more savory?
Adjust the flavor after cooking, one small addition at a time. Add lime juice for a brighter, tangier finish, or fish sauce for more savory depth. Taste after each addition because curry paste, broth, and fish sauce all contribute salt. If the broth tastes too concentrated, loosen it with a little warm broth or water.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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