Cook the rice according to the instructions on the package.
Cut the chicken breast and broccoli into smaller pieces. Mince the garlic and ginger.
Add the olive oil to a pan and heat the pan using medium-high heat.
Steam the broccoli. Simply add water to a pot, bring it to a boil, add the broccoli, reduce the heat and cover the pot with the lid. Depending on how soft you prefer the broccoli, adjust the time for steaming it. Set aside when finished.
Make the teriyaki sauce by adding all of the ingredients to a small bowl and set aside.
Add the chicken breast to the pan. Sear from one side until browned, flip the chicken breast pieces and sear from the other side. Take the chicken pieces out of the pan and set aside.
Add the teriyaki sauce mix to the pan and heat it up. Let it simmer until the sauce thickens while continuously stirring. If the sauce does not get thick enough by itself, add a bit of the cornstarch slurry and adjust until the sauce has thickened. If the sauce gets too thick, add some water to the sauce.
Add the chicken pieces back to the pan and cover them with the teriyaki sauce.
Serve the rice, broccoli and teriyaki chicken in a bowl and enjoy!