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Preheat oven to 400 degrees and grease a 6-count donut pan.
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In a large bowl, stir flour, sugar, baking powder, salt, and spices together.
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In a separate bowl, whisk together egg, buttermilk, and vanilla extract.
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Make a well in the center of the dry ingredients, and add in the wet ingredients. Gently stir until just combined (batter will be very thick).
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Add in sour cream, butter, and pumpkin puree. Mix until well combined.
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Spoon or pipe batter into the donut pan.
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Bake donuts for 10-12 minutes, or until the donuts have risen and the tops of the donuts 'spring' back when lightly touched.
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Allow to cool for at least 5 minutes before removing from the tray.
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In the microwave (or on the stove) melt butter and maple syrup together. Gently whisk in powdered sugar, vanilla extract, and cinnamon. Once combined, allow the glaze to cool for 8-10 minutes or so, so it can thicken.
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When ready to glaze the donuts, give the glaze a quick stir, then dunk each donut about halfway into the glaze. Place donuts on a wire cooling rack to give the glaze time to set (about 10 minutes).
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Enjoy!