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Slow cooker sausage casserole over mashed potatoes with mushrooms and peppers.

Slow Cooker Sausage Casserole: The Ultimate Comfort Food

This hearty slow-cooker sausage casserole is perfect for a cozy family dinner. Packed with flavourful sausages, vibrant vegetables, and a rich tomato-based sauce, it’s a comforting dish that’s easy to prepare.
5 from 3 votes
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Prep Time: 15 minutes
Cook Time: 4 hours
Total Time: 4 hours 15 minutes
Servings: 6 servings
Author: Deborah Rainford

Ingredients

  • 8-10 thick-cut pork sausages, see notes
  • 1 red onion, thinly sliced
  • 2 cloves garlic, minced (see notes)
  • 2 red bell peppers, deseeded and chopped
  • 120 g (1 ¾ cups) brown chestnut mushrooms, chopped (see notes)
  • 2 teaspoons mixed dried herbs, see notes
  • 1 tablespoon tomato puree
  • 400 g (14 oz) tin chopped tomatoes
  • 1 tablespoon Worcestershire sauce
  • 400-500 ml (1 ¾ cups) beef stock made with a stock cube
  • Salt and pepper to taste
  • Optional: 400 g tin cannellini beans or navy beans, drained

Instructions

  • Brown the Sausages: Heat a tablespoon of oil over medium heat in a frying pan. Add sausages and brown on all sides. Transfer the browned sausages to the slow cooker. (Optional step to enhance the sausage flavors.)
  • Prepare Vegetables: Add the thinly sliced red onion, minced garlic, chopped red bell peppers, and mushrooms to the slow cooker.
  • Add Wet Ingredients: Stir in the tomato puree, tinned tomatoes, Worcestershire sauce, and beef stock. Mix well to combine.
  • Season: Add the mixed dried herbs, salt, and pepper. Stir to incorporate all ingredients.
  • Slow Cook: Cover and set the slow cooker on low for 6-8 hours or on high for 4-5 hours.
  • Optional: If using, add the cannellini or navy beans 30 minutes before cooking is complete. Stir well.
  • Serve: Stir the casserole well, taste, and adjust the seasoning if needed. Serve over mashed potatoes.

Notes

  • Sausages: Cumberland or Lincolnshire sausages are preferred, but pork and apple or Italian-style sausages are good substitutes.
  • Garlic: Fresh minced garlic can be replaced with garlic paste for convenience.
  • Mushrooms: White closed-cup mushrooms can be used, though they have a milder flavor compared to brown mushrooms. Pre-sliced mushrooms can save time.
  • Herbs: Mixed dried herbs can be replaced with dried thyme for a different flavor profile.

Nutrition

Calories: 573kcal | Carbohydrates: 24g | Protein: 27g | Fat: 41g | Saturated Fat: 13g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 18g | Trans Fat: 0.3g | Cholesterol: 108mg | Sodium: 1232mg | Potassium: 830mg | Fiber: 3g | Sugar: 5g | Vitamin A: 1452IU | Vitamin C: 61mg | Calcium: 59mg | Iron: 3mg
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