One Tray Portuguese Chicken with Brown Rice

• 2 tbsp extra virgin olive oil
• 1 brown onion, diced
• 1 red capsicum (pepper), diced
• 400 g corn kernels, tinned, drained
• 2 tbsp Portuguese chicken seasoning
• 1.5 cup brown rice (raw)
• 500 ml chicken stock
• 0.5 cup water
• 600 g chicken thigh cutlets (bone-in)