Preheat the oven to 375 degrees and line a baking sheet or cast-iron skillet with parchment paper.

Whisk together the flour, sugar, baking soda, baking powder, and salt in a large bowl. Cut in the butter until it resembles coarse pea-sized crumbs. Add the buttermilk and mix just until it begins to come together. Add additional buttermilk if necessary until a soft dough forms. Turn the dough out onto a lightly floured surface, sprinkle the raisins over the top, and knead a few times to incorporate.

Pat the dough into a 6 to 7-inch circle. With a floured knife, cut an “x” into the dough, about ½ inch deep. Transfer the dough to the parchment-lined baking sheet or cast-iron skillet.

Bake the Irish Soda Bread for 35 to 45 minutes or until the bread is a beautiful golden brown. Transfer the soda bread to a rack to cool completely before slicing.