The formula of onion oil cake is: medium gluten powder 1000g, yeast 10g, foam source 15g and water 500g. Technology: Melt yeast with warm water, add dough water, mix foam source with dry flour, then add dough water to make dough, and let it stand for 2-8 hours (according to room temperature until it is ready). Roll into a cake, sprinkle with fine salt and cooked pepper noodles, spread evenly, pour with oil, scrape evenly, sprinkle with chopped green onion, sprinkle with a thin layer of noodles, roll into long strips, knead into dough, roll into cakes, and bake until both sides are golden.