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Sausage and vegetable casserole in a serving dish on a wooden background.
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4.8 from 10 votes

Slow Cooker Sausage Casserole

Easy and delicious recipe for sausage casserole in your slow cooker, perfect for autumn and winter or a warming family dish all year round.
Course Main Course
Cuisine Slow Cooker
Keyword family friendly
Prep Time 10 minutes
Cook Time 8 hours
Total Time 8 hours 10 minutes
Servings 4 people
Calories 364kcal


  • sausages (preferably good quality this will prevent them from disintegrating the slow cooker during the long cooking time)
  • 2 red onions chopped
  • 1 yellow pepper chopped
  • 0.5 of large sweet potato chopped
  • 400 g tin chopped tomatoes
  • 1 tbsp tomato purée
  • 250 ml boiling water
  • 1 rich beef stockpot
  • 1 tsp dried rosemary
  • 2 tsp dried oregano
  • Cornflour to thicken if needed


  • Brown the sausages on all sides over high heat in a dry pan.
  • Chop the vegetables (2 red onions, half a yellow pepper, half a large sweet potato) and place them in the slow cooker pot.
  • Add the tomato puree (1 tbsp), can of tinned tomatoes, stock (250 ml boiling water and a beef stockpot), herbs ( 1 tsp rosemary. 2 tsp dried oregano), and mix gently.
  • Place the browned sausage on top of the vegetabes and tomato mixture, then put on the lid and cook on high for 4-5 hours or on low for 7-8 hours.
  • An hour before serving, check if the sauce is thick enough. If not, make a paste using 1 tbsp cornflour and a little water, then stir the paste into the pot and let it cook for the last hour, to thicken.
  • Serve with mash or pasta for a warming autumn and winter dish, with green vegetables on the side.



Side dishes
Sausage casserole goes well with mashed potato, pasta or rice, or I also like it with new potatoes or on top of a jacket potato as well.
Green vegetables like broccoli or peas, those family favourites, are a good match
You can freeze this recipe.
To reheat, defrost well then reheat to piping hot in a saucepan or microwave. Never reheat in the slow cooker (after defrosting) as it does not get hot enough quickly enough. Also never reheat from frozen in the slow cooker.
Do I need to brown the sausages first?
The dish looks better when you brown the sausages in a pan first, otherwise they look very anaemic and not appetising. It also adds flavour. If you don’t mind about that you can skip the browning stage.
Can I use frozen sausages in the slow cooker?
I recommend not using frozen meat of any kind in the slow cooker. If you have frozen sausages, defrost them fully first.
Can I cook this in a casserole dish instead?
If you don’t have a slow cooker the recipe can be made in the same way in a casserole dish. Brown the sausages, fry the onions too if desired, add the ingredients in the same way.
Add 200 ml additional water (since the water will evaporate). Simmer for 45 minutes on medium heat.
How long does it take to cook sausages in the slow cooker?
The basic cooking times for a slow cooker are 8 hours on low or 4-5 hours on high. The same applies for this recipe.


Calories: 364kcal | Carbohydrates: 22g | Protein: 20g | Fat: 22g | Saturated Fat: 12g | Sodium: 159mg | Potassium: 403mg | Fiber: 3g | Sugar: 5g | Vitamin A: 2500IU | Vitamin C: 68.8mg | Calcium: 64mg | Iron: 1.7mg