Cook the rice according to the instructions on the package. Once cooked, season with salt and pepper to taste, cover with a lid, and set aside.
In a non-stick pan, heat the oil over medium-high heat; stir-fry the chicken, ginger, and garlic until the chicken is lightly browned.
Add in the broth, soy sauce, broccoli, water chestnuts; cover with a lid and bring to a simmer until the chicken is no longer pink and cooked through, about 8-10 minutes.
Stir in the cornstarch mixture until the sauce becomes thick and smooth, 1-2 minutes.
Serve with rice, garnish with scallions and cashews.