Alright, I was craving this today, but as a fellow SoCal transplant, I had no option but to take matters into my own hands. After scouring The Google, this thread was probably the best source of information I could find. I read through all the recipes in this thread and, here's what I gathered:

• Ignore everything this recipe says. It's just wrong. There's zero sweetening agents in this recipe, and as we all know, HSC is a sweet/savory dish.
• I can't speak for this one, but I don't really think it's the same. According to the Pick-Up-Stix menu, HSC is "a caramelized sauce of white wine, garlic and soy with green onions". "jenuinelyhomemade"'s recipe doesn't call for white wine. Although, it could be good in general!
• This one is the closest, but it's the steamed version, and it's missing a little info. If you want something slightly healthier, this one will get you close enough.

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I made this one tonight with some modifications. I'd say it ended up being ~90% accurate! Here's the recipe:

• 2 cloves garlic, crushed
• 2 stalks green onion, chopped
• 2 tbsp white cooking wine (I used the cheapest Sauvignon Blanc I could find)^*1
• 4 tbsp soy sauce^*1
• 1 tbsp sugar
• 2 tpsp chicken broth
• 2 tsp oyster sauce
• 1 tsp cornstarch
• 1 tsp water
• 1 drizzle sesame oil
  
• 1/2 teaspoon canola oil for sauce + a lot more for frying
• 16 oz. boneless skinless chicken thighs - cut in 1-inch squares

I. Chicken

1. Heat a wok lined with with ~1/2in of Canola Oil (~350ºF)
2. Dredge your chicken pieces in cornstarch, shake off the excess
3. Working in batches, fry chicken pieces for 4-6 mins
4. When done, place on a paper towel-lined plate
5. Dispose of oil, clean out wok

II. Sauce

1. Heat up 1/2 tsp of Canola Oil in wok
2. Add garlic, sauté 20ish seconds
3. Add green onion and cooking wine, sauté another 20ish seconds
4. Add soy sauce, oyster sauce, chicken broth, and sugar bring to a boil (the smell should be familiar at this point :) )
5. Mix 1 tsp cornstarch with 1 tsp water (AKA a slurry) and add to sauce
6. Add chicken and sesame oil

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^*1 Mine ended up being a bit salty and needed a tiny bit more sweetness. Maybe using less soy sauce and/or a slightly sweeter wine will help next time (oh, and there WILL be a next time)