Roasted red pepper soup with crispy croutons

Name: Roasted red pepper soup with crispy croutons
Ingredients: 2 red onions roughly chopped; 2 carrots (250g), roughly chopped; 1 tsp olive oil; 2 garlic cloves roughly chopped; 200g jarred roasted red peppers (drained weight), drained and roughly chopped; 1 tsp rose harissa paste; 1 tsp cumin seeds; 1 tsp Kashmiri chilli powder (or any other chilli powder); 850ml low-salt vegetable stock; 4 tbsp natural yogurt to serve; 100g slightly stale wholemeal crusty bread cut into cubes; 1tsp olive oil