Preheat your oven to 425°F (220°C) to create a crispy crust.
Line your baking sheet with parchment paper or lightly grease it to prevent sticking.
In a large mixing bowl, combine the gluten-free all-purpose flour, baking powder, baking soda, sea salt, and caraway seeds. Whisk until well blended.
Gently fold in the rinsed and dried raisins or currants into the dry mixture.
Make a well in the center of the dry ingredients and pour in the buttermilk. Mix with a wooden spoon or spatula until the dough begins to come together; it will be sticky.
Turn the dough out onto a lightly floured surface. Gently knead the dough just until it forms a cohesive ball, about 30 seconds. Avoid over-kneading.
Shape the dough into a round loaf and place it onto the prepared baking sheet.
Score a deep cross on the top of the loaf with a sharp knife to help it rise evenly.
Bake the bread for 30-35 minutes, or until the crust is golden brown and the loaf sounds hollow when tapped on the bottom.
Remove the bread from the oven and transfer to a cooling rack. Let cool for at least 15 minutes before slicing.