Slow Cooker Sausage Casserole

Last updated on: March 9, 2026

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This slow cooker sausage casserole is one of those slow cooker recipes that earns its place on repeat.

It’s hands-off, forgiving, and comes out tasting like you’ve put far more effort in than you actually have.

We’re talking tender chicken sausages, soft veg, and a thick, herby tomato sauce that clings to everything in the best possible way.

Each serving packs around 30 g protein for roughly 359 calories, making it a genuinely satisfying dinner rather than a beige bowl of regret.

The protein heavy lifting comes from lean chicken sausages and butterbeans, which also add fibre to keep you fuller for longer.

You’ll need a slow cooker and a non-stick pan to brown things off first (don’t skip this – flavour matters).

It’s ideal for family dinners, meal prep, or those days when you want comfort food that still aligns with your goals.

Why You’ll Love This High-Protein Recipe

• Delivers ~35 g protein per serving without giant portions

• Classic slow cooker sausage casserole vibes, but lighter and higher protein

• Minimal prep, maximum payoff

• Thick, rich sauce – no watery casseroles here

• Excellent for batch cooking and leftovers

Slow Cooker Chicken Sausage Casserole Key Ingredients

Lean chicken sausages. Lower in fat than pork sausages but still juicy and packed with protein once slow cooked.

Butterbeans. Creamy, filling and a sneaky source of extra protein and fibre.

Chopped tomatoes. The base of the casserole, giving richness and body.

Smoked paprika. Adds warmth and depth without making it spicy.

Onion, carrot, celery & red pepper. Classic casserole veg that adds sweetness and balance.

Cornflour. A small amount goes a long way to thicken the sauce properly.

Slow Cooker Sausage Casserole

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Discover the ultimate Slow Cooker Sausage Casserole recipe! Lean chicken sausages, hearty veg, and a rich tomato sauce come together for a healthy, comforting meal. Perfect with crusty bread or mash!

• Total Time: 5 hrs
• Yield: 4 1x

Ingredients

Units MUS Scale 1x2x3x

• 8 lean chicken sausages (450-500g total)
• 1 medium onion, sliced (120g)
• 2 carrots, sliced (150g)
• 2 celery sticks, sliced (120g)
• 1 red pepper, chopped (120g)
• 2 garlic cloves, crushed
• 1 × 400g tin chopped tomatoes
• 200ml chicken stock
• 1 tbsp tomato puree
• 1 tsp smoked paprika
• 1 tsp dried thyme
• 1 tsp dried oregano
• 1 bay leaf
• 1 tbsp cornflour mixed with 1 tbsp cold water
• Salt and black pepper, to taste
• 1 × 400g tin butterbeans, drained and rinsed

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Instructions

Heat a non-stick pan over medium heat and brown the sausages for 5–6 minutes, turning often. Transfer to the slow cooker.

In the same pan, add the onion, carrots, celery, garlic, and red pepper. Cook for 4–5 minutes until lightly softened. Transfer to the slow cooker.

Add the chopped tomatoes, chicken stock, tomato purée, smoked paprika, thyme, oregano, bay leaf, cornflour and a pinch of salt and pepper. Stir gently to combine.

Cook on low for 6 hours or high for 3 hours.

Stir in the butterbeans and continue cooking:

• Low: 45–60 minutes
• High: 25–30 minutes

Remove the bay leaf, taste, adjust seasoning, and serve with steamed greens.

• Author: Scott Baptie
• Prep Time: 10 mins
• Cook Time: 4 - 5 hrs
• Method: Slow Cooker

Nutrition

• Serving Size: 1
• Calories: 359
• Fat: 11g
• Carbohydrates: 36g
• Protein: 29g

Keeping Slow Cooker Sausage Casserole Fresh For Later

To Store

Cool completely, then store in an airtight container in the fridge for up to 3 days.

To Reheat

Reheat in a saucepan over medium heat or in the microwave until piping hot, stirring halfway through.

To Freeze

Freeze in portions for up to 3 months. Defrost overnight in the fridge before reheating.

Serving Suggestions

• Serve with mashed potatoes or buttery new potatoes

• Spoon over rice or pearl barley

• Keep it lighter with steamed greens or cabbage

Variations & Tips

• Swap butterbeans for cannellini beans or chickpeas for a similar protein boost

• Add extra protein by stirring in a handful of cooked lentils

• Like it spicy? Add chilli flakes or a pinch of cayenne

• Browning the sausages first is non-negotiable – it adds huge flavour

• If your sauce looks thin at the end, leave the lid off for 20 minutes on high

Frequently Asked Questions (FAQs)

Can I make this slow cooker sausage casserole with pork sausages?

Yes, but calories and fat will be higher. Lean chicken sausages keep it lighter and higher in protein per calorie.

Is this slow cooker sausage casserole suitable for freezing?

Absolutely. It freezes very well and is ideal for batch cooking.

How can I make this even higher in protein?

Use extra sausages, add more beans, or stir in cooked lentils at the end.

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