Preheat oven to 350°

Combine first 6 ingredients in a large bowl or stand mixer

In a small bowl combine sour cream, cooled melted butter and egg whites. Whisk until blended, then stir in the cheese

Add sour cream mix to the dry ingredients and blend. The mixture will be crumbly

Turn the dough onto a lightly floured board and knead a few times just to bring dough together

Shape into a long roll, about 14 - 16"

Place roll on a baking sheet lined with parchment paper and flatten gently to 1" thickness

Bake for 30 minutes

Remove roll to a cooling rack for 8 minutes, reduce oven heat to 325°, and carefully slice diagonally into 1/2" slices. This works best with a very sharp serrated knife

Place back onto baking sheet, cut side down and bake for 15 minutes

Flip slices over and return to the oven for another 15 minutes

Remove to a cooling rack and let cool