Large size eggs are the standard in recipes.
Most times the recipe will say large, but not always.
The size egg can make a difference.
If you buy eggs in different sizes, or you have your own eggs because you raise chickens, you can adjust the number you use to make sure your food turns out.
Here is an egg size equivalent chart:
1 large egg= 1 jumbo, 1 extra large, 1 medium, or 1 small egg
2 large eggs= 2 jumbo, 2 extra large, 2 medium, or 3 small eggs
3 large eggs= 2 jumbo, 3 extra large, 3 medium, or 4 small eggs
4 large eggs= 3 jumbo, 4 extra large, 5 medium, or 5 small eggs
5 large eggs= 4 jumbo, 4 extra large, 6 medium, or 7 small eggs