The basic ingredients for making an omelette include eggs, milk or cream, salt, black pepper, butter or oil, and optional fillings like cheese, vegetables, or meat. The eggs are whisked together with milk or cream, salt, and pepper until well-combined. Then, the butter or oil is melted in a nonstick skillet over medium heat, and the egg mixture is poured in the pan. Once the edges start to set, any desired fillings are added to one side of the omelette. The other side is then folded over the fillings, and the omelette is slid onto a plate and served immediately.