Q: How do I cook with bantam eggs?
A: The eggs of bantam chickens are smaller than the eggs we're used to seeing in the grocery store. Just how small? Of course, it really depends on the hen. For instance, the eggs of Sebright bantams and Belgian bantams, are SUPER tiny, but the eggs of Silkie bantams are simply small. So all bantam eggs are not equivalent, the same way some large fowl breeds lay jumbo eggs, while others lay medium eggs.
Here are the size classifications for eggs:
1 jumbo egg - 2.50 ounces
1 extra-large egg - 2.25 ounces
1 large egg - 2 ounces
1 medium egg - 1.75 ounces
1 small egg - 1.50 ounces
Depending on the bantam, her eggs may be in the small range, or she may lay eggs that are tiny, 1 to 1.25 ounces or even smaller. When a recipe calls for an egg without giving a specific size (as most do), it is calling for a large egg (2 ounces or so). So, if you have a kitchen or egg scale and can weigh your eggs, you will be able to determine exactly how many of your smaller eggs you need to use in a recipe calling for large eggs. If you don't have a kitchen scale, you will simply have to estimate.
Keep in mind that there is usually a higher yolk-to-white ratio in bantam eggs, so when baking you may still see some variation in your results.