All my recipes are developed using a digital scale and the metric system (grams and millilitres). Cup measurements are available as a conversion but these, unfortunately, won't always be as accurate. For best results, I always recommend baking with a digital scale.
Egg Size:
When it comes to eggs, I always buy the Mixed-weight Free-range Eggs. Generally speaking, egg size doesn’t make a huge difference in most baking, unless you are using sizes that lean into the extremes. But with that in mind, medium-sized eggs are probably the best option if you are unsure what size eggs to use.