Easy Slow Cooker Sweet and Sour Chicken
If your weeknights feel like a race against the clock, you need dinners that work harder than you do. This Slow Cooker Sweet and Sour Chicken delivers a tangy, sticky, deeply savoury meal with almost zero hands-on time, and I’ve been making it for over 5 years precisely because it fits seamlessly into our busiest evenings.
Recipe Overview
- Prep time: 10 minutes
- Cook time: 4 hours on high or 6 hours on low
- Total time: 4 hours 10 minutes (or 6 hours 10 minutes)
- Servings: 6
- Difficulty: Easy
Why You’ll Love This Slow Cooker Sweet and Sour Chicken
- Minimal hands-on time: You spend just ten minutes prepping, then the slow cooker does all the work. No standing over a hot pan, no stirring, and no guesswork.
- One-pot cleanup: Everything cooks in a single pot, meaning you have only the slow cooker insert, a cutting board, and a knife to wash. This is a lifesaver on chaotic evenings.
- Make-ahead dream: You can prep the sauce and chop the chicken the night before, store everything in the fridge, and simply tip it into the slow cooker in the morning. Dinner is sorted before you’ve had your coffee.
- Perfectly tender chicken every time: The low, slow cooking breaks down the chicken until it’s fork-tender and soaks up the sweet and tangy sauce without drying out.
- Family-approved flavour: Friends always ask me for this recipe after trying it at dinner parties because the balance of sweet and tangy is spot-on, and there’s no weird aftertaste from bottled sauces.
Ingredients You’ll Need
- 800g boneless, skinless chicken thighs (or breast, but thighs stay juicier)
- 1 large red bell pepper, cut into 2cm chunks
- 1 large green bell pepper, cut into 2cm chunks
- 1 large onion, cut into 2cm chunks
- 2 tablespoons tomato purée
- 120ml pineapple juice (from a can of pineapple chunks is perfect)
- 60ml rice vinegar (not seasoned)
- 60ml low-sodium chicken stock
- 3 tablespoons light brown sugar (packed)
- 2 tablespoons cornflour
- 2 tablespoons water
- 2 tablespoons soy sauce (use tamari for gluten-free)
- 2 cloves garlic, minced
- 1 teaspoon ground ginger (or 1 tablespoon fresh, grated)
- 400g can pineapple chunks, drained (reserve the juice for the sauce)
Tip: For the best texture, cut your chicken and vegetables into uniform 2cm pieces. This ensures everything cooks at the same rate and you don’t end up with mushy peppers and raw chicken.
Equipment You’ll Need
- Slow cooker (5-6 quart)
- Sharp knife and cutting board
- Measuring cups and spoons
- Small bowl for the cornflour slurry
How to Make Slow Cooker Sweet and Sour Chicken
- Prepare the sauce base. In a small bowl, whisk together the tomato purée, pineapple juice, rice vinegar, chicken stock, brown sugar, soy sauce, minced garlic, and ground ginger. The mixture should look a deep reddish-orange and smell sharply sweet and tangy.
- Layer the ingredients. Place the chicken pieces in a single layer at the bottom of your slow cooker. The chicken will look pale and raw, but don’t worry — it will cook through completely. Scatter the red and green bell pepper chunks and the onion chunks evenly over the top. The colours should be vibrant and fresh.
- Pour the sauce. Pour your prepared sauce evenly over the chicken and vegetables. Gently stir everything once so the sauce coats all the pieces. You should see the sauce pooling around the chicken, with flecks of pepper and onion peeking through.
- Cook low and slow. Put the lid on and cook on low for 6 hours or on high for 4 hours. After about 2 hours on high, your kitchen will start to smell sweet, tangy, and savoury — a sign the magic is happening. The chicken will look opaque and slightly puffed as it cooks.
- Make the cornflour slurry. About 20 minutes before the end of cooking, mix the cornflour with 2 tablespoons of cold water in a small bowl. Stir until it’s completely smooth, with no lumps. The slurry should look like thin, white milk.
- Thicken the sauce. Remove the lid and give the chicken and vegetables a gentle stir. The chicken should be tender enough to pull apart with a fork, and the peppers will have softened but still hold their shape. Pour the cornflour slurry into the slow cooker and stir it in thoroughly.
- Add the pineapple. Gently fold in the drained pineapple chunks. Replace the lid and cook on high for another 10-15 minutes. When you lift the lid, the sauce should have thickened to a glossy, syrupy consistency that coats the back of a spoon. The pineapple will be warm and slightly softened.
- Serve immediately. Spoon the chicken and vegetables over steamed rice. You should see the thick, shiny sauce clinging to every piece of chicken and pepper, with the sweet pineapple chunks scattered throughout.
Tips From My Kitchen
- Use chicken thighs for guaranteed tenderness. Chicken breasts can dry out in a slow cooker, even with a sauce. Thighs have a higher fat content, which keeps them moist and succulent during the long cooking time, and they shred beautifully at the end.
- Add the cornflour slurry at the end, not the beginning. Cornflour loses its thickening power if it’s cooked for hours. By adding it in the last 15 minutes, you get a thick, glossy sauce that clings to the chicken rather than a watery, thin liquid that pools on the plate.
- Don’t skip browning the chicken. Wait — I know I said minimal cleanup, but hear me out. If you have five extra minutes, searing the chicken in a hot pan before adding it to the slow cooker adds a deep, caramelised flavour. If you’re truly in a rush, skip it. The dish will still be delicious, just less complex.
- Cut everything the same size. I cannot stress this enough. When bell peppers and chicken are cut into uniform 2cm pieces, they cook at the same rate. You avoid the disappointment of mushy peppers and undercooked chicken in the same bite. Take the extra two minutes to be precise.
- Double the sauce if you love extra for rice. This recipe makes a generous amount of sauce, but if you’re like my family and want to drown your rice, increase the pineapple juice, vinegar, and stock by half. Keep the cornflour slurry at the same ratio — two tablespoons cornflour to two tablespoons water — to thicken the larger volume.
What to Serve With Slow Cooker Sweet and Sour Chicken
- Steamed jasmine rice or basmati rice to soak up all that glossy sauce
- Egg-fried rice for a more substantial meal
- Steamed broccoli or green beans for a pop of colour and crunch
- A simple cucumber salad with rice vinegar and sesame seeds
- For a low-carb option, serve over cauliflower rice
Still hungry for ideas? You might also love Easy Sweet Sour Chicken Recipe, Slow Cooker Mississippi Pot Roast from our sister kitchens.
Frequently Asked Questions
Can I use frozen chicken in this recipe?
Yes, you can use frozen chicken thighs, but you must increase the cooking time by about an hour on high or two hours on low. I recommend thawing the chicken first for more even cooking and a better texture. If using frozen, ensure the internal temperature reaches 74°C before serving.
How do I store leftovers, and how long will they keep?
Store leftovers in an airtight container in the fridge for up to four days. The flavours actually deepen overnight, so it tastes even better the next day. Reheat gently in a pan or microwave, adding a splash of water if the sauce has thickened too much.
Can I make this recipe gluten-free?
Absolutely. Simply swap the regular soy sauce for tamari or a certified gluten-free soy sauce. Everything else in the recipe is naturally gluten-free, including the cornflour, rice vinegar, and chicken stock. Check your chicken stock label to be sure it’s gluten-free.
Why did my sauce turn out watery?
Watery sauce usually happens when the cornflour slurry is added too early or the slow cooker lid is left off during cooking, allowing condensation to drip back in. Always add the slurry in the last 15 minutes and keep the lid on throughout the cooking time. If the sauce is still thin, mix another teaspoon of cornflour with a tablespoon of cold water and stir it in.
Can I add other vegetables to this dish?
Yes, you can add carrots, snap peas, or even water chestnuts for extra crunch. Add carrots with the peppers at the start, but add delicate vegetables like snap peas or baby corn in the last 30 minutes so they stay crisp-tender. Avoid adding too much extra liquid from watery vegetables like courgettes, or your sauce will thin out.
Slow Cooker Sweet and Sour Chicken
Tender slow-cooked chicken thighs in a sweet and tangy sauce with bell peppers, onion, and pineapple chunks. Serve over steamed rice for an easy, flavorful weeknight dinner.
Ingredients
Method
- Prepare the sauce base. In a small bowl, whisk together the tomato purée, pineapple juice, rice vinegar, chicken stock, brown sugar, soy sauce, minced garlic, and ground ginger. The mixture should look a deep reddish-orange and smell sharply sweet and tangy.
- Layer the ingredients. Place the chicken pieces in a single layer at the bottom of your slow cooker. The chicken will look pale and raw, but don't worry — it will cook through completely. Scatter the red and green bell pepper chunks and the onion chunks evenly over the top. The colours should be vibrant and fresh.
- Pour the sauce. Pour your prepared sauce evenly over the chicken and vegetables. Gently stir everything once so the sauce coats all the pieces. You should see the sauce pooling around the chicken, with flecks of pepper and onion peeking through.
- Cook low and slow. Put the lid on and cook on low for 6 hours or on high for 4 hours. After about 2 hours on high, your kitchen will start to smell sweet, tangy, and savoury — a sign the magic is happening. The chicken will look opaque and slightly puffed as it cooks.
- Make the cornflour slurry. About 20 minutes before the end of cooking, mix the cornflour with 2 tablespoons of cold water in a small bowl. Stir until it's completely smooth, with no lumps. The slurry should look like thin, white milk.
- Thicken the sauce. Remove the lid and give the chicken and vegetables a gentle stir. The chicken should be tender enough to pull apart with a fork, and the peppers will have softened but still hold their shape. Pour the cornflour slurry into the slow cooker and stir it in thoroughly.
- Add the pineapple. Gently fold in the drained pineapple chunks. Replace the lid and cook on high for another 10-15 minutes. When you lift the lid, the sauce should have thickened to a glossy, syrupy consistency that coats the back of a spoon. The pineapple will be warm and slightly softened.
- Serve immediately. Spoon the chicken and vegetables over steamed rice. You should see the thick, shiny sauce clinging to every piece of chicken and pepper, with the sweet pineapple chunks scattered throughout.
Notes
For gluten-free, use tamari instead of soy sauce. Chicken thighs stay juicier than breasts. Reserve pineapple juice from the can for the sauce.
I love hearing how this recipe works in your kitchen. Did you add extra pineapple? Serve it with noodles instead of rice? Drop a comment below and let me know how your family enjoyed this Slow Cooker Sweet and Sour Chicken — your tweaks might inspire someone else’s next dinner.
