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Preheat over to 350
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Whisk together cake flour, sugar, brown sugar, baking soda, baking powder, pumpkin pie spice and salt
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In a separate bowl, whisk together eggs, yogurt, buttermilk, and pumpkin
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Add the wet ingredients to the dry and stir to combine
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Coat 2 donut pans with cooking spray
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Fill the donut pans with batter almost all the way to the top
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Bake 15 - 17 minutes
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Cool in pans on wire rack 5 - 7 minutes, then turn out of pan and cool completely
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Combine white chocolate chips and heavy cream and microwave for 30 second intervals, stirring in between, until combined and no lumps
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Dunk each donut in the white chocolate ganache or use a spoon to pour over tops