Sausage & white bean casserole with sweet potato

Ingredients

• 1 red pepper, deseeded and cut into chunks
• 2 carrot, cut into thick slices
• 2 red onion, cut into wedges
• 1 red chilli, deseeded and sliced
• 375 g chipolatas, cut into thirds
• 400 g tinned cherry tomatoes, peeled
• 400 g butter beans, drained
• 200 ml chicken stock
• 2 tsp dijon mustard
• 100 g frozen peas
• 1/4 tsp sea salt flakes
• 250 g sweet potatoes, peeled and cut into chunks