Had a chance to test the recipe I gave recently for soda bread using yogurt back in the good Ol' USA. Some minor modifications are a good idea. The self-rising flour here, or at least the flour from Publix, is very salty. So don't add any salt, or use regular flour and add your own baking powder. The flour here is also a different, slightly bitter, wheat and much finer ground. So relative to the UK, the bread had a salty sour taste. The crusty texture was quite similar to the UK version.
Here's the recipe modified for the USA.
300g self-rising flour (2 cups +-)
1 cup Greek yogurt (my scale's battery went out right here)
water if needed.
Mix the flour and the yogurt, then if needed to make a dough add a small amount of cold water. Knead gently and put on a floured baking sheet. Cut a cross in the top and bake for about 1/2 hour until the loaf sounds hollow and is a nice color.