In the kitchen.
Lin Xu held a sieve and finely sifted the flour. The purpose of this was to make the flour's texture finer and sift out small particles, preventing an unpleasant texture. When making snacks with flour, this step was indispensable. It was also a piece of knowledge that came with the Dough Mixing Skill.
After sifting the flour, Lin Xu placed it into a dough mixing bowl. Then he took a few eggs and cracked them into a separate bowl. He scooped in a small spoonful of yeast and a small spoonful of baking powder, used chopsticks to beat the egg mixture, and then poured it into the mixing bowl to combine with the flour, forming a dough.
Without the Dough Mixing Skill, this step would have been quite difficult because Lin Xu wouldn't have known how many eggs to add, or whether the dough should be firmer or softer. But with the skill, he was like a master chef who had worked in a dessert kitchen for many years. Every movement was extremely standard.