Slow cooker paella

Name: Slow cooker paella
Ingredients: 2 tbsp olive oil; 4 skinless, boneless chicken thighs, thickly sliced; 240g chorizo ring, sliced; 1 onion, sliced; 2 garlic cloves, crushed; 1 tbsp sweet smoked paprika; pinch of saffron (optional); 150ml white wine; 300g paella rice; 400g can chopped tomatoes; 400ml chicken stock; 150g frozen peas; 200g fresh or frozen raw king prawns, peeled; ½ small bunch of parsley, finely chopped; lemon wedges and crusty bread, to serve (optional)