Preheat oven to 400 degrees F. Line a baking sheet with parchment or spray a loaf pan with non-stick spray. *shaping options before starting!
Whisk together the flour, whole wheat flour, salt, baking soda, and 2 teaspoons sugar in a bowl. Cut the butter into the flour mixture until pieces are crumb-size. *I suggest grating cold butter with a cheese grater and then crumbling mixture with fingers.
Make a well in the center of the mixture and pour in the oil and buttermilk. Stir with a spatula until dry mixture is completely moistened.
Freeform Instructions: Move the dough to a generously floured surface. The dough will be quite wet. Use flour to avoid sticking and Lightly knead the dough a few times and then form into a round ball. Place on prepared baking sheet. Use a sharp knife to cut a cross into the top of the loaf in an x shape. Brush the top with about 1 tablespoon buttermilk or milk, and sprinkle 1-2 teaspoons sugar over the top.
Loaf Instructions: Simply pour dough mixture into loaf pans instead of forming into a shape. Depending on your pan size you may get 2-3 smaller loaves or 1-2 large. Fill pans about 3/4 full.
Bake in the preheated oven for 30 minutes. Reduce heat to 375 degrees F, rotate pan and bake another 20-30 minutes or until top is golden brown and skewer comes out clean.
Allow loaf to cool on a wire rack for about 15 minutes before slicing.