Step 1

Preheat oven to 350 degrees F. Spray a 8.5 x 4.5-inch loaf pan with cooking spray and set aside.

Step 2

In the bowl of a stand mixer, combine flour, sugar, baking powder, baking soda and salt. Add the cold butter and mix on low until the butter is incorporated into the flour.

Step 3

In a separate bowl, whisk together egg, buttermilk, sour cream and orange zest. Gradually add the egg mixture to the dry ingredients. Stir in the raisins and caraway seeds (if using).

Step 4

Transfer to the prepared loaf pan. The dough will be very sticky, so it helps to dampen your fingers or spatula with a little bit of water so that you can spread the dough in the pan without too much sticking. Bake for 35-45 minutes, or until a toothpick inserted in the center comes out clean.

Step 5

Remove from pan and cool completely on a wire rack before slicing.