Slice the meat on the bias into thin strips and place in a bowl.
Mix together the ingredients for the sauce - soy sauce, oyster sauce, minced garlic, brown sugar, corn starch (Sriracha and sesame oil are optional).
Pour half the sauce over the meat and mix to coat. Allow to marinate for 20-30 minutes.
Place the vegetable oil in a wok over high heat and allow to heat until shimmering.
Carefully add in the meat in a single layer and allow to cook for 2 minutes until it browns on the first side. Then flip the meat and allow to cook for another minute.
Add in the broccoli and mix. Cook for 2 minutes.
Pour in the remainder of the sauce and cook for 1-2 minutes until the sauce thickens and coats the meat and broccoli.
In a large pan, heat 1 tsp of oil over medium heat. Once heated, add in a beaten egg and quickly scramble. Remove the egg from the pan to a plate and place to the side.
Return the pan to the heat, add in the remaining oil and allow to heat over medium heat.
Carefully add in the frozen vegetables and cook for 2 minutes until they thaw out and begin to soften.
Move the vegetables to one side of the plan, raise the heat to high and add in the rice. Allow the rice to cook for 2 minutes then stir to combine the rice and vegetables.
Once combined, add in the soy sauce and scallions. Stir to combine.
Allow the rice mixture to cook for 3-5 minutes, stirring occasionally, allowing the rice and vegetables to brown slightly.
Stir and taste for seasonings -- add in salt, pepper or additional soy sauce if needed.