Preheat oven to 425. Line a baking sheet with parchment paper and set aside.
In a small bowl, combine hoisin sauce, oil, apricot jam, honey, soy sauce, vinegar, salt, garlic and mustard. Whisk to combine; set aside.
Combine onion, broccoli and sauce in a large bowl. Spread mixture out on prepared baking pan.
Bake for 10 minutes. Remove from oven, stir in chicken strips, then return to oven. Bake for an additional 15 minutes, until chicken is cooked through.
Serve hot, with rice, if desired.
Recipe by Overtime Cook at https://overtimecook.com/2018/06/25/sheet-pan-chicken-and-broccoli/