In a bowl, mix together baking soda, corn starch, pepper, garlic powder, soy sauce, and grated ginger to form the marinade.
Add the thinly sliced steak to the marinade, ensuring each piece is well coated. Let it marinate for at least 30 minutes.
Cook the Quinoa:
Rinse the quinoa under cold water.
In a pot, bring the chicken broth to a boil. Add the quinoa, reduce the heat to low, cover, and simmer for about 15-20 minutes or until the liquid is absorbed and the quinoa is fluffy.
Prepare the Sauce:
In a separate bowl, whisk together beef broth, brown sugar, soy sauce, sesame oil, pepper, and garlic chili sauce.
In another small bowl, mix corn starch with 1/2 cup beef broth to create a slurry. Set aside.
Cook the Beef:
Heat a large pan over medium-high heat. Add the marinated beef and cook until browned. Remove the beef and set it aside.
Cook the Broccoli:
In the same pan, add 1/2 cup of water and broccoli florets. Cover and let it steam for about 3-5 minutes until the broccoli is tender but still crisp.
Combine and Finish:
Return the beef to the pan with the broccoli.
Pour in the sauce mixture and bring to a simmer.
Stir in the corn starch slurry and continue to cook, stirring, until the sauce has thickened.
Serve the beef and broccoli over the cooked quinoa.