Slow Cooker Veggie Tikka Masala

• 800 g tin chickpeas, drained, rinsed
• 1 large brown onion, diced
• 3 carrots, cut in large coins
• 0.5 cauliflower, cut into florets
• 400 g tin diced tomato
• 140 g Tikka Masala paste
• 2 cup green peas
• 0.75 cup plain Greek yoghurt
• 450 g steamed brown rice