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Preheat oven to 350 degrees F.
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In a large bowl mix together the dry ingredients for the cake.
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In a separate bowl mix together the wet ingredients for the cake (butter, eggs, apple butter, vanilla, and vinegar).
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Add the wet ingredients to the dry ingredients and fold together until blended, being careful not to overmix.
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Pour the batter into a greased 9 inch Bundt pan.
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Bake in the preheated oven for 30-35 minutes.
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While the cake is baking, make the frosting.
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Add all of the frosting ingredients to a food processor and whip together until well mixed.
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Flip the cake out onto a large plate or cake stand (running a knife around the edges to loosen as needed).
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Allow the cake to cool completely before frosting the top.
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Sprinkle with chopped nuts as desired.
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Store the leftovers in the fridge for up to one week.