Pre-heat oven to 325 degrees Fahrenheit. Generously grease the Bundt pan with melted butter.
Sift together flour, salt, baking soda, pumpkin spice, cinnamon and nutmeg to combine well. Set aside.
Beat granulated sugar and egg until light yellow. Add in oil, vanilla and brown sugar and sour cream/yogurt.
Continue beating until smooth.
Pour in half of the dry mixture and mix until well blended. Mix in the rest. Do not over mix.
Add apple slices to the remaining flour to coat. Fold in to the mixture until just blended. Note that the batter is really thick.
Pour the mixture into the well oiled bundt pan and tap it three times.
Bake for 1 hour 15 minutes. Let it cool and serve.
