Cook rice according to packet instructions and set aside, keeping it warm.
In a small bowl, mix together soy sauce, brown sugar (or honey), sesame oil, gochujang, minced garlic, ginger, and a splash of water. Stir until well combined and set aside.
Heat a large frying pan or wok over medium-high heat with a small amount of oil.
Add chicken pieces to the pan and cook until golden brown and cooked through, stirring occasionally to ensure even cooking.
Once the chicken is cooked, pour in the prepared sauce and stir well to coat the chicken evenly.
Let the sauce simmer for 2–3 minutes until it thickens slightly and becomes glossy and sticky.
While the sauce is reducing, prepare your vegetables (slice cucumber, grate carrot, and chop spring onions).
Assemble the bowls by adding rice as the base, then topping with the Korean chicken and fresh vegetables.
Garnish with extra spring onions, sesame seeds, or a drizzle of sesame oil if desired.
Serve immediately while hot, or portion into containers for meal prep lunches.