One of my fondest memories from summers in Ireland are the soda bread toasts with butter and jam… had I known it was this easy to bake I would have started baking my own at home much sooner!
Mix the dry ingredients first. At this point, you can add to the dry mix raisins, seeds, oats… It should total 750 gr, in the proportions you want (I like doing 450 gr wholewheat, 250 gr white, plus 50 gr oats).
Add a couple of tablespoons of oil to the buttermilk, mix it well and let it sit before mixing with the rest of the ingredients. Knead with a spoon until you get a firm though which still sticks a bit in your fingers. (If you don't have buttermilk, you can use milk and add a couple of tablespoons of vinegar or lemon juice plus the oil instead.)