Wash and pat dry the chicken breast, then cut into bite-sized pieces.
Mince the 4 garlic cloves and 40g of ginger. Dice the red peppers, carrots, and fresh mushrooms. Cut the onion into small chunks. Cut the spring onions into rings.
Heat roughly 1-2 tablespoons of oil in a large pan with high sides over medium heat for about 1-2 minutes until hot.
Add the minced garlic and ginger, cook for 1-2 minutes until fragrant.
Stir in 3 tablespoons of curry paste and cook for 1 minute, stirring constantly.
Add the thick part from the top of one coconut milk can, stir well, and increase heat to medium-high for 2 minutes.
Add the chicken pieces, carrots, peppers, mushrooms, onion chunks, and spring onion rings. Pour in the 3 tablespoons of light soy sauce, 1 tablespoon of instant chicken broth, and the remaining coconut milk.
Bring to a simmer over medium heat and cook for 10 minutes, stirring occasionally, until the chicken reaches 74°C (165°F) internally.
Season with salt to taste. Garnish with fresh coriander and fresh red Thai chili peppers if desired.