Finely dice the onion and garlic and roughly chop the mushrooms and pepper. Drain the kidney beans.
Add all of the ingredients to the slow cooker, stir, pop the lid on and cook on high for 3 hours 30 mins (or low for 7 hours). If it is too thin, take the lid off for the last 30 minutes.
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Notes
Step-by-Step Photos: My blog post includes helpful step-by-step photos to help guide you through making this recipe.Substitutions & Variations: I have included a list of these in the post above.To Store: Cool quickly, then keep in an airtight container in the fridge for up to 2 days. Reheat once, in a pot or pan over a low heat or in the microwave, until piping hot.To Freeze: Allow to cool, then store in a sealed container in the freezer for up to 3 months. Defrost in the fridge overnight and reheat until piping hot in a pot or the microwave (you may need a splash of water).Tip 1: The better quality beans work best here.Tip 2: If you love spicy chillies then just up the spices to taste.Tip 3: Got any spare veg in the bottom of the fridge? Add it 1 hour before the end of the cooking time.