Add starter, masa, and salt to large bowl and mix. Add oil and mix until combined. Then squeeze dough by hand until completely mixed. The texture should be similar to biscuit dough.
Knead dough on countertop briefly to develop gluten, and shape into a loaf. Cut dough in half and flatten.
Wrap tightly in plastic wrap. Chill in fridge for 1-12 hours, depending on desired taste.
Take dough out of plastic wrap. Cut in half. Place on parchment on top of a pan. Roll out dough as thin as possible, and try to keep dough in a rectangle.
Cut dough with a pizza roller or desired tool, into desired shape. Brush the top of the dough with oil.
Salt dough with coarse salt. Bake in oven at 350 for 20 minutes.
Repeat steps 4-6 with remaining dough.
