Start by mixing the levain, oat milk and the water.
Next add the flour and mix for about 5-10 mins with a rubber spatula or clean hands. Keep in mind, the dough will be very wet, so fold in from the corners to the center and continue in a circular motion for 5-10 mins.
Transfer to a clean bowl, cover with a clean cloth and rest for 1 hour. This first phase is called autolysis.
After 1 hour, add the maple syrup, salt & Olive oil and knead again. Use the same circular fold in motion from the corners and continue for 5-10 mins until well integrated. If you have a stand mixer, even better. I do not, so I just use my hands.
Let the dough rest for another 1 hour. Do a coil fold – start by lifting the dough from the middle using both hands so that the edges peel off the bowl. Fold in the edges under, turn 90 degrees and repeat for 3 more times.
Repeat the coil folds for every half hour for 4 times. Total resting from autolysis to coil folds is 4 hours. The coil folds and resting phase will help the dough to build strength.
Cover with a lid and place in the fridge for 12-16 hrs.
Next day, generously coat your working surface with flour. Place the dough and divide into 4 equal parts. About 185g each. Note: If they are not equal parts, the final bread will not look even. Try to get them as close as possible.