preheat oven to 350 degrees.
spray bundt pan with cooking spray and set aside.
in a small mixing bowl, mix flour, salt and baking powder. set aside.
cream together sugar, butter and shortening.
beat in one egg at a time. make sure to beat well after each one. (at least a minute). stir in vanilla extract.
alternate stirring in flour/salt/baking mixture and buttermilk until well mixed and batter is smooth.
take 3/4 cup of sprinkles and place in a ziploc. Add about 1 tbsp of flour and shake so that the sprinkles are coated. add coated sprinkles to the cake batter and stir lightly so that the sprinkles don't bleed.
add cake mix to bundt pan and bake for 35-40 minutes depending on your oven. around 30 minutes start testing by inserting a toothpick. Cake is done when the toothpick comes moist but not wet)
place bundt pan on metal wire rack to cool for 15 minutes.
after 15 minutes flip cake onto tray or serving platter. let cool for another 10-20 minutes and then add fluffy white frosting. Top with remaining sprinkles. Enjoy!