Stir together the sauce: In a small bowl, whisk soy sauce, water, honey, rice vinegar, sesame oil, cornstarch, and red pepper flakes.
Set aside. The cornstarch will thicken the sauce later.
Prep the chicken and veggies: Pat the chicken dry with paper towels for better browning. Slice your vegetables and separate the white and green parts of the green onions.
Heat the skillet: Place a large nonstick or stainless skillet over medium-high heat.
Add the oil and let it shimmer.
Sear the chicken: Add chicken in a single layer with the white parts of the green onions. Season lightly with salt and pepper. Cook 5–6 minutes, flipping once, until golden and nearly cooked through.
Add aromatics: Reduce heat to medium.
Stir in garlic and ginger. Cook 30 seconds until fragrant, stirring so they don’t burn.
Cook the vegetables: Add broccoli and bell pepper. Cook 2–3 minutes, tossing occasionally.
Add snap peas and cook 1–2 minutes until crisp-tender. You want color and a bit of crunch.
Pour in the sauce: Whisk the sauce again, then pour it into the skillet. Stir continuously for 1–2 minutes until it thickens and coats the chicken and veggies.
If it gets too thick, add a splash of water.
Finish and garnish: Turn off the heat. Sprinkle in the green tops of the onions and sesame seeds. Taste and adjust with a squeeze of lime, a touch more vinegar, or a pinch of red pepper flakes.
Serve: Spoon over brown rice, quinoa, or cauliflower rice.
Serve hot.