In a medium saucepan over medium heat, combine 1 cup filtered water, 1/3 cup soy sauce, 1/3 cup honey, Sriracha (1–2 Tbsp to taste), and the minced garlic; bring to a gentle boil, stirring occasionally.
In a small bowl, whisk 2 tablespoons cornstarch with 2 tablespoons cold water until smooth, then pour the slurry into the simmering sauce and stir until the sauce thickens; reduce heat to low and keep warm.
Place the cut chicken pieces in a large zip-top bag and add 1/2 cup cornstarch; seal and shake or toss until the chicken is evenly coated.
Heat a large non-stick skillet over medium heat and add a light coating of oil. Add the coated chicken in a single layer (work in batches to avoid crowding) and sauté until cooked through and browned, about 3–5 minutes per side depending on piece size.
When all chicken is cooked, return any batches to the pan, turn off the heat, then pour the warm sauce over the chicken and stir to coat evenly.
Season with salt and pepper to taste if needed, then serve over rice if desired and garnish with sesame seeds and sliced chives or green onions.