In a small bowl, whisk together soy sauce, honey, cornstarch, vinegar, orange zest and red pepper flakes. Set aside.
In a large nonstick skillet, heat 1 Tbsp olive oil and 1 Tbsp sesame oil over high heat. Sprinkle steak with salt and pepper. Add to hot skillet. Cook until browned, about 2-3 minutes. Then flip and cook until no longer pink in the center.
Move steak to the side of the pan, add mandarins to the other side of the pan. Drizzle soy sauce mixture into pan. Cook just until thickened. Transfer into GoodCook meal prep container.
Wipe skillet clean with a paper towel, return to stove. Heat 1 Tbsp olive oil and 1 Tbsp sesame oil over high heat. Add zucchini noodles. Cook until edges of some noodles begin to brown. Salt and pepper lightly, if desired. Transfer to meal prep containers.
Serve immediately or refrigerate until ready to reheat and enjoy.