01 - Whisk together the eggs, milk, salt, and white pepper in a large bowl until smooth and fully incorporated.
02 - Add the bean sprouts, carrots, green onions, mushrooms, bell pepper, and diced protein to the egg mixture. Stir until evenly distributed.
03 - Heat 2-3 tablespoons of vegetable oil in a large nonstick skillet or wok over medium-high heat until shimmering.
04 - Scoop approximately 1/2 cup of the egg mixture into the hot pan for each patty. Gently flatten to create even, round portions. Cook 2-3 patties at a time depending on pan size.
05 - Cook each side for 2-3 minutes until golden brown and crispy edges form. Carefully flip and cook the opposite side until set. Transfer to a paper towel-lined plate. Repeat with remaining mixture, adding more oil as needed.
06 - Combine the chicken broth, soy sauce, oyster sauce, sesame oil, and white pepper in a small saucepan. Bring to a gentle simmer over medium heat.
07 - Whisk the cornstarch with cold water in a small bowl until smooth to create a slurry. Stir this mixture into the simmering sauce and cook for 1-2 minutes until thickened and glossy.
08 - Plate the crispy Egg Foo Young patties hot, drizzling generously with the savory brown gravy. Garnish with additional sliced green onions if desired.