Preheat your oven to 325 F.
Spray a bundt pan generously with non stick spray.
Combine flour, cocoa, baking soda and salt in a medium sized bowl. Whisk. Set aside.
Combine milk and yogurt in a separate medium sized bowl. Whisk. Set aside.
In a stand mixer cream the sugars and butter together till very light and fluffy.
Begin to beat in eggs, one at a time until well incorporated.
Turn mixer down to low and add the flour mixture you set aside earlier, and alternate with the milk mixture you also set aside. Do it in about three additions and end with the flour mixture.
Now add the pecans and mix by hand.
Pour the mixture into the bundt pan and smooth out.
Place in your preheated oven for about 55 to 60 minutes.
Allow to cool in pan.
Invert onto a plate.