For the Egg Foo Young:
Prepare the Ingredients: In a large mixing bowl, whisk the eggs until well beaten. Add the bean sprouts, cooked meat, mushrooms, green onions, carrots, bell peppers, garlic, soy sauce, salt, and pepper. Mix until all ingredients are evenly combined.
Heat the Skillet: Heat a large skillet or wok over medium-high heat and add enough vegetable oil to cover the bottom of the pan.
Cook the Egg Foo Young: Scoop about 1/2 cup of the egg mixture into the hot skillet. Use a spatula to shape the mixture into a round patty. Cook for 2-3 minutes on each side, or until the patty is golden brown and cooked through. Remove from the skillet and place on a paper towel-lined plate to drain excess oil. Repeat with the remaining egg mixture.
For the Gravy:
Make the Gravy: In a small saucepan, combine the chicken broth, soy sauce, and oyster sauce. Bring to a simmer over medium heat.
Thicken the Gravy: In a small bowl, mix the cornstarch with water until smooth. Slowly pour the cornstarch mixture into the simmering broth, stirring constantly until the gravy thickens.
Serve:
Plate the Dish: Place the cooked Egg Foo Young patties on a serving plate.
Top with Gravy: Pour the hot gravy over the patties.
Garnish: Garnish with additional chopped green onions or sesame seeds if desired.