I have spices, baking powder, etc but no eggs, milk, yeast or the like that it seems like every recipe for breads uses. I made something halfway between pancakes and biscuits by just throwing ingredients together yesterday that was edible if just barely, and while I'm sure I could do better trying again (I think I used too much oil and not enough water, going off how dense it was) I'd rather just learn what to do instead of trying to iteratively figure it out.
A basic sourdough bread is made with just the yeast and bacteria that's in the flour naturally, so all you really need is flour and water. Requires little effort, but some patience, planning and practice.
Though chances are they're using bleached flour, not like, unbleached rye flour that you could grow a sourdough culture from.
The yeast culture also hangs out in the air, so bleached flour still works most of the time
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