In a bowl, add the 180 ml warm water (around 100°F to 110°F) and sprinkle 1/4 tsp. active dry yeast over the surface. Let it sit for about 5 minutes until the yeast dissolves and becomes frothy.
In another mixing bowl, add 250 g all-purpose flour then stir in the yeast mixture while stirring to form a shaggy dough.
The Kneading
Once combined, add 1 Tbsp. vegetable oil and mix well. Let the dough rest for 15 minutes while it's covered.
After resting, knead the dough until smooth. Let the dough rest for another 20 minutes.
The Rolling
While the dough is resting, prepare the chopped 120 g scallions while the dough rests.
Dust the work surface with flour or oil to prevent sticking, then divide the dough into the amount of portions you want (the default being two). Roll each piece into a thin rectangle skin.
Sprinkle half of the 1/2 tsp salt on the surface, drizzle half of the 2 tsp. vegetable oil, and spread it evenly. Dust with some dry flour and then add half of the chopped 120 g scallions. (Half is mentioned because the default of the recipe is 2 pancakes, if you are making 4, you need to quarter).
Roll the dough tightly from one end and shape it into a round ball. Roll the shaped dough into about 0.5 cm thick pancakes.
The Cooking
Heat a pan on medium and brush it with oil. Place the pancakes in the pan.
Cook on medium heat until one side is golden (about 3-5 minutes), then flip to cook the other side until both sides are crispy and golden brown (about 2-3 minutes).
Remove the pancakes from the pan and allow to cool slightly before serving.
The Serving
Serve your crispy and flaky Chinese Scallion Pancakes [中式葱油饼].