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Preheat the oven to 350 degrees. Generously grease and flour a bundt pan.
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In the bowl of a stand mixer, beat eggs and sugar at a high speed for 3 minutes or until pale and creamy. Turn mixer to medium and add oil, butter and vanilla, beating until just combined.
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Add sweet potato puree and mix until fully incorporated, pausing to scrape down the sides of the bowl.
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In a separate bowl, whisk together flour, apple pie spice, baking powder, baking soda, and salt.
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In a measuring cup, whisk together bourbon and buttermilk.
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Turn mixer to low and alternate adding flour and buttermilk mixture to egg mixture, beginning and ending with flour mixture. Continue to beat at a low speed until fully combined.
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Pour batter into the prepared pan and bake for 60-70 minutes until a toothpick inserted comes out clean. Cool on a rack for 15 minutes before removing from pan.
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Cool entirely and sprinkle with powdered sugar before serving.