Prep the chicken: Pat chicken dry, then season with salt and pepper. Toss with 1 tablespoon cornstarch until lightly coated.
Whisk the sauce: In a bowl, mix orange juice, zest, soy sauce, rice vinegar, brown sugar or honey, sesame oil, chili flakes, and remaining 1 tablespoon cornstarch.
Stir until smooth.
Cook the ramen: Boil ramen according to package directions, 1 minute less than usual so they stay springy. Drain and set aside. If using veggies like broccoli, blanch them in the same pot during the last minute.
Sear the chicken: Heat oil in a large skillet over medium-high.
Add chicken in a single layer and cook 3–4 minutes per side until golden and cooked through. Don’t crowd the pan—do two batches if needed.
Build flavor: Lower heat to medium. Push chicken to the sides and add garlic and ginger to the center.
Stir 30 seconds until fragrant.
Sauce it up: Pour in the orange sauce. Stir and simmer 1–2 minutes until glossy and slightly thick. If it gets too thick, splash in a bit of water.
Toss with noodles: Add cooked ramen (and veggies if using) to the skillet.
Tongs help here. Toss until everything is coated and hot, 1–2 minutes.
Finish and serve: Taste and adjust—add more soy for salt, vinegar for brightness, or honey for sweetness. Top with scallions and sesame seeds.
Serve right away.