As you incorporate egg into your mixture, it will initially look like scrambled eggs, but that's normal. Keep whisking vigorously and add a small amount of egg at a time. Stop adding when you obtain a smooth paste that is too dense to drop from a height. It will likely stick inside the blades of your wire whisk - just whack the whisk against the inner sides of your bowl to release, and continue to mix with a flexible spatula. Once you've transferred the pâte a choux into your piping bag and snipped the opening, if it drips out without any pressure, or it spreads out after being piped, you've gone too far with egg and you'll need to start over. Another indication that too much egg was added, is that the chouxs won't puff up as much, will probably develop tiny moisture droplets on the crust, and will deflate after baking, remaining wet inside.
Keep refrigerated for up to 3 days.
It's important that you measure accurately with
Metric Kitchen Scales. For (U.S. option
HERE).