Slow Cooker Ratatouille

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This slow cooker ratatouille is insanely rich and flavourful, and works beautifully as a standalone stew, or on pasta. Plus, it’s made with 100% vegetables!

Slow cooker ratatouille in a bowl being scooped with a wooden spoon.

100% vegetables! That’s what’s in this slow cooker ratatouille – just pure veg.

Well, plus a pinch of herbs and some salt and pepper, so I suppose technically it’s more like 99% vegetables… but still, that’s pretty great. And you won’t believe the incredible flavour you can get from all those veg!

Pasta with ratatouille in a bowl.

What is ratatouille?

Ratatouille is the sort of dish that reminds you just how amazing vegetables can be, all on their own – no frills.

It’s a classic French dish, and as with a lot of old, traditional recipes, there’s no one ‘right’ way to make it – it’s pretty much just a rich vegetable stew, which you can put your own spin on.

The movie Ratatouille (which was apparently released in 2007?! Where on earth have the past 15 years gone?!) focuses on a much more intricate version of the dish, with vegetables delicately layered up in perfect stripes… but that’s not at all like this version. I’m not really a ‘delicate’ kind of cook – with this slow cooker ratatouille, you just dump everything into one pot in a beautiful, messy heap.

Overhead shot of a rich vegetable ratatouille in a bowl being scooped with a wooden spoon.

Why cook ratatouille in the slow cooker?

I’ve made ratatouille a million times, using loads of different methods – stovetop ratatouille, oven-baked ratatouille, and of course now in the slow cooker. All the different methods have their pros and cons, but the slow cooker method is definitely my favourite.

The slow cooker recipe is really quick to throw together – just chop, chop, chop (there will always be a lot of chopping…), then into the pot it all goes.

Badda bing badda boom.

And as well as being super easy, slow cooking the vegetables also makes them beautifully soft and sweet – it makes for an incredible ratatouille.

A selection of Mediterranean vegetables on a black chopping board.

What is ratatouille made of?

As I mentioned before, my slow cooker ratatouille is 99% vegetables. You really don’t need to add much else at all – vegetables have so much flavour when you cook them well.

Veggies are not just something to stick on the side of a meal as an afterthought – they deserve to be the star of the show.

As well as fresh veggies, I also added some passata, which is basically a tomato sauce, except it’s made entirely from sieved tomatoes – no other ingredients! A spoonful of Italian-style dried herbs and a good pinch of salt and pepper is all you need to finish your slow cooker ratatouille.

Chopped Mediterranean vegetables in a slow cooker pot.

What vegetables can you use in ratatouille?

Technically you could put any veg you like in your ratatouille. You probably know by now that I hate the idea of ‘rules’ when it comes to food – if you can make a tasty meal, go for it, and don’t worry about authenticity.

We’re ultimately all here to eat good food, right? So if you want to stick some carrot in your ratatouille, I’m certainly not going to stop you.

However, I do usually tend stick to Mediterranean-style veg when I’m making ratatouille. The flavours all go beautifully together, and when they’re cooked right down in the slow cooker, they end up so sweet and delicious.

I use:

  • onion (brown or red)
  • garlic
  • bell peppers (various colours!)
  • aubergine (eggplant)
  • mushrooms

Courgette (zucchini) also works well in ratatouille, but bear in mind that it can end up a bit mushy when cooked in a slow cooker. If you don’t mind that, go for it!

Ratatouille in a slow cooker.

Rich vegetable stew

As you can see… your slow cooker ratatouille will turn out pretty amazing.

Just a few hours in the slow cooker, and your vegetables will have transformed into a soft, rich stew with heeeeaps of flavour. With almost no effort from you!

As with all slow cooker recipes, there will be a little bit of excess liquid around your veggies, as it can’t cook off like it can when you’re cooking on the stovetop. But I certainly don’t think that’s a negative at all – just more tasty sauce! There’s no added water in this recipe, so it’s entirely made from those tasty vegetable juices.

Rich vegetable stew in a white bowl.

What do you serve ratatouille with?

I pretty much always serve my ratatouille as a pasta sauce. Just stir it through some cooked pasta, top it with a bit of grated cheese, and you’ve got an insanely delicious, insanely easy, veggie-packed dinner.

If you prefer, you can just eat it on its own, as a vegetable stew – don’t forget the crusty bread and butter for mopping up the bowl! You could also add a tin of cannellini beans to the slow cooker if you fancy an even heartier stew.

Either way, this slow cooker ratatouille is so easy to make, and will really make you fall in love with vegetables again.

Ratatouille mixed through pasta.

Slow cooker ratatouille

This slow cooker ratatouille is insanely rich and flavourful, and works beautifully as a standalone stew, or on pasta. Plus, it's made with 100% vegetables!

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5 from 21 votes
Print Pin Comment
Prep Time: 10 minutes
Cook Time: 3 hours 30 minutes
Total Time: 3 hours 40 minutes
Servings: 3 people
Calories: 120kcal
Author: Becca Heyes


  • 1 medium aubergine (eggplant)
  • 1 onion (red or brown), peeled
  • 1 red pepper
  • 1 green pepper
  • 4 large mushrooms
  • 4 cloves garlic, minced
  • 250 ml (~ 1 cup) passata or tomato sauce
  • 1 tbsp tomato puree
  • 1 tsp Italian mixed herbs
  • Salt
  • Black pepper


  • Cut all of the vegetables into 1cm dice. Add them to the slow cooker with the remaining ingredients, and mix well. Cook on high for 3 1/2 hours, stirring once or twice during cooking.


Nutrition Facts
Slow cooker ratatouille
Amount Per Serving (1 portion)
Calories 120 Calories from Fat 5
% Daily Value*
Fat 0.6g1%
Saturated Fat 0g0%
Cholesterol 0mg0%
Sodium 74mg3%
Potassium 678mg19%
Carbohydrates 25.8g9%
Fiber 9.9g40%
Sugar 10.1g11%
Protein 5g10%
Calcium 44mg4%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.

Nutritional information is approximate, and will depend on your exact ingredients. Please calculate your own nutritional values if you require accuracy for health reasons.

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  1. This is a recipe that will endear itself to the most discriminating of connoisseurs. Serve with a crusty baguette.

  2. I know this is a long past, but I just found this recipe looking for a ratatouille recipe. We are not a mushroom family. Can you think of a replacement that would work in the slow cooker? Thanks!

    1. Perhaps a courgette (zucchini)? It will cook down quite soft in the slow cooker but I actually think it might be quite nice if it breaks down into the sauce a bit?