Preheat oven 350°F
In a food processor or rough chop the walnuts, toast them in a small saute pan, make sure you watch them closely they can go from ohh nice to damn start over really quickly.
in a 9x13 inch pan using the melted butter all over the pan and set aside.
in a stand mixer using the paddle attachment, cream together the sugars and then add the eggs. On low mix together for about 3-5 minutes, until they become very pale in color. Add the vanilla and the yogurt and mix well.
In a separate bowl, combine the flour, salt and baking soda and mix well to combine. Add the dry ingredients to the wet until combined. Using a spatula, mix in the cooled walnuts just until blended.
Pour the batter into the prepared pan and bake for 45 minutes, check the cake, if there it too much color happening you can cover with tinfoil and then finish baking for another 10-15 minutes. Remove from the oven and cool slightly