The primary ingredient in a basic pancake recipe is flour. Typically, all-purpose flour is used, combined with other essential ingredients like milk, eggs, baking powder, sugar, and a pinch of salt. The flour provides the structure, while the baking powder acts as a leavening agent, making the pancakes fluffy. Depending on the specific recipe, variations may include additional ingredients like buttermilk or vanilla for flavor. Overall, flour is fundamental in creating a delectable pancake breakfast.