Pat the chicken thighs dry with paper towels and season with salt and pepper.
Heat vegetable oil in a large pot over medium-high heat and sear chicken thighs skin-side down for 5–7 minutes until golden brown.
Flip the chicken and add soy sauce, brown sugar, minced garlic, and minced ginger. Stir to coat the chicken.
Pour in chicken broth to cover the chicken, bring to a boil, then reduce heat and simmer for 20 minutes.
Rinse jasmine rice under cold water, combine with 4 cups of water in another pot, bring to a boil, cover, and cook for 15–20 minutes.
For a thicker broth, mix cornstarch with water and stir into the broth during the last few minutes of cooking.
Remove chicken from pot, slice, and serve over rice with broth. Garnish with green onions and cilantro.