Make sure you have the batter mixed, eggs cracked, sauce made, oysters shucked, and herbs cut before beginning to cook.
Heat up a large nonstick skillet or a well-seasoned cast-iron pan over medium-high heat. If you are using cast-iron, it is very important that the pan is seasoned to the point of being non-stick. When the pan is hot, add 1 tsp neutral oil to the pan as well as the bean sprouts. Season with a pinch of salt and cook until the bean sprouts are very lightly wilted, about 1 minute.
Place the lightly wilted bean sprouts in the center of a serving plate. The oyster omelet will be placed on top of these bean sprouts.
Wipe out the pan and add about 5 Tbsp neutral oil. Keep pan on medium-high heat.
The next few steps will take place quickly. When the oil is shimmering, stir the batter well and then pour in a thin layer all over the pan.
Let the batter cook for about 10-20 seconds or until is has started to set around the edges but the middle and top are still a bit undercooked. You can tell the parts that are undercooked because they look a bit more opaque.
Before it sets up completely, use a spatula to slightly break up the pancake and then push it in on itself to form an approximately 5-inch diameter pancake. The pancake should look a bit rough and it is ok if there are holes in the pancake. The reason for breaking it up a bit is to create more nooks and crannies to get crispy as it cooks in oil.
Allow the pancake to cook for about 2-3 minutes over medium-high heat or until the bottom and edges start to get crispy and there is almost no raw batter left on top. Make sure there is enough oil in the pan to allow the pancake to crisp. Add more oil to the pan if necessary. Run the spatula underneath the pancake to ensure it is not stuck to the pan.
When the batter has crisped, place the 2 raw eggs on top of the pancake. It is ok if the eggs fall off the edges of the pancake.
Immediately break up the eggs with the spatula and spread the broken egg mixture all over the top of the pancake. Egg will inevitably spill over the sides of the pancake. That is ok. Simply use the spatula to pull the eggs back towards the pancake and "shape" the finished pancake. Try to move the raw egg in a way that fills in any holes or cracks in the pancake. Let the pancake cook like this until the egg is about 80% cooked, 1-2 more minutes.
When the egg is 80% cooked, Flip the pancake over.
As soon as you have flipped the pancake, make sure there is a little oil on the other side of the pan and add the oysters and garlic.
Stir fry the oysters for about 10-15 seconds, or until they start to just barely cook and firm up. Do not allow the oyster to stay in the pan longer than 30 seconds. Get ready to quickly remove the pancake and the oysters from the pan.
Place the pancake on top of the wilted beans sprouts. Scatter the oysters on top of the pancake and then scatter the scallions and cilantro on top of everything. Drizzle the pancake with half of the sauce and keep the rest of the sauce on the side to add as you eat.