Remove the pan from the heat and add the flour, mixing vigorously with a wooden spoon until the flour is evenly distributed and there are no visible flour clumps. Crack one egg atop the flour mixture and quickly mix with the wooden spoon until it is incorporated. Add the remaining 3 eggs, 1 at a time, mixing thoroughly before adding the next egg. Use a rubber spatula to spread the cream base batter evenly on the greased cookie sheet. Bake for 10-12 minutes, until a deep, golden brown. Let cool.