Step 1 Spray a large saucepan with oil and place over medium heat. Add onion and cook for 3–4 minutes, until softened. Add curry paste and cook for 3 minutes, stirring constantly.
Step 2 Increase heat to medium-high, add chicken and brown all over.
Step 3 Add evaporated milk, bring to the boil, then reduce to a simmer. Cover and simmer for 5 minutes, stirring occasionally.
Step 4 Add vegetables to pan and simmer for 5–6 minutes, or until chicken and vegetables are cooked through.
Step 5 Transfer 5 tablespoons curry sauce to a bowl and combine with cornflour. Return to pan and heat until sauce thickens.
Step 6 Garnish curry with coriander and serve with cooked rice.