Heat oven to 350 degrees F. Coat a 9-by-5-inch loaf pan with cooking spray and line bottom with parchment paper, allowing it to extend over two sides. In a large bowl, whisk together flours, cream of tartar, baking soda, baking powder and salt. Stir in 1 cup nuts, the oats and oat bran.

In another bowl, whisk together milk and yogurt; add 1/2 cup olives. Stir into flour mixture until just combined. Spoon into prepared pan and smooth top. Sprinkle with remaining 1 tablespoon olives and 2 tablespoons nuts. Bake until golden and pulling away from sides of pan, about 1 hour 10 minutes. Holding ends of paper, immediately lift loaf out of pan and transfer to a wire rack. Let cool completely, about 1 hour. Peel off paper and cut into 1/2 inch slices.