Overnight biga:
First combine your overnight biga ingredients in a small bowl. Stir it all together until there are no dry spots of flour. Cover the bowl with plastic wrap or a clean kitchen towel and leave it on the counter overnight or at least 4 hours. 

Ciabatta bread dough:
In the bowl of your stand mixer or a large bowl, weigh out all of your dough ingredients and also add in all of your overnight biga. If you're using a stand mixer knead on medium or medium-low for 8 minutes, until you have a slightly sticky but smooth dough. If you are kneading by hand, you will need to knead on your counter or board for about 10 to 15 minutes until you get a smooth dough.

Once your dough is formed, add it to a lightly oiled bowl and let rise, lightly covered in a warm spot in your kitchen for 1.5 to 2 hours. 

After 1.5 to 2 hours, your dough should have doubled. Remove it from the bowl to your counter and flatten it out into a rough rectangle shape. Pretend your rectangle is a letter and fold it up into thirds. Turn your "letter" 90 degrees on the counter, press it into another rectangle and fold it in thirds again. Place the dough back into your bowl. The folding process you just did, adds structure to your bread.

Let dough rise again in a warm spot for another 45 minutes. 

After 45 minutes, it is time to shape the ciabatta sandwich rolls. Remove dough from bowl to counter and form into a rectangle. 

For smaller sized rolls (8 rolls):
If you want smaller sized rolls, form dough into a rectangle 12 inches across by 8 inches tall. Using a ruler, cut dough into 3 inch x 4 inch rectangles. If you don't want to measure, just cut your rectangle into 4 rolls across by 2 rolls tall.

For longer/larger rolls (6 rolls):
If you want larger sized rolls, form dough into a rectangle 9 inches across by 10 inches tall. Using a ruler, cut dough into 3 inch x 5 inch rectangles. If you don't want to measure, just cut your rectangle into 3 rolls across by 2 rolls tall.

Once you've got your rolls cut into rectangles, add to a parchment lined sheet pan and let rise covered with oiled plastic wrap or a clean kitchen towel for 1.5 hours. 

Pre-heat oven to 425 F (220 degrees C)

Before you add the rolls to the oven, spray them liberally with water from a spray bottle. If you don't have a spray bottle, you can lightly spread water on each roll with your fingers. 

Bake 20 minutes or ciabatta is golden. Rotate the pan halfway through the cooking time for even browning.