In a medium mixing bowl, whisk together soy sauce, gochujang, brown sugar, sesame oil, garlic, ginger, and rice vinegar until smooth.
Add the chicken pieces to the marinade and toss until fully coated.
Cover and refrigerate for at least 30 minutes or up to 4 hours for deeper flavor.
Heat a large skillet over medium-high heat.
Add the marinated chicken in a single layer. Cook in batches if necessary to avoid overcrowding.
Cook for 3–4 minutes per side until the chicken is cooked through and caramelized.
Divide the cooked rice evenly among four serving bowls.
Arrange the cooked Korean BBQ Chicken Bowls with chicken placed over the rice.
Add cucumber, shredded carrots, edamame, and kimchi around the bowl.
Sprinkle with sesame seeds and sliced green onions.
Serve immediately while warm.