In a mixing bowl, whisk together 2 tablespoons gochujang paste, 1 tablespoon soy sauce, 1 tablespoon honey, minced garlic, grated ginger, and 1/4 cup water until smooth to make the sauce.
Heat 1 tablespoon vegetable oil in a skillet over medium heat.
Add the bite-sized chicken thigh pieces and cook, stirring occasionally, until browned on all sides, about 5–7 minutes.
Pour the sauce over the browned chicken, reduce heat to low, and simmer uncovered for about 10 minutes, stirring occasionally, until the chicken is cooked through and the sauce thickens.
Transfer to a serving dish and garnish with sliced green onions and 1 teaspoon sesame seeds before serving.