How to make veggie chilli?

Ingredients

Serves: 6

• 2 (400g) whole plum tomatoes (tins whole plum tomatoe would be ok too) 
• 1 (400g) tin chickpeas, drained
• 2 courgettes, thinly sliced
• 1 onion, chopped
• 2 carrots, sliced
• 2 stalks celery, sliced
• 1 red pepper, chopped

• 1 teaspoon chilli powder
• 1 green chilli, seeded and chopped
• 2 cloves garlic, minced
• 1 tablespoon dried oregano
• 2 teaspoons ground cumin
• 1 teaspoon salt