What do you mean by "natural" yogurt? I'm sure that you mean unflavored, but do you mean Greek style as well? Or will any other type do?
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Any plain yogurt should work fine.
Greek-style yogurt should be okay, but plain natural yoghurt often has more water in it than Greek-Style and this might make a difference in the density of the cake. Plain, unflavoured yogurt is labeled natural.
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