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1
Let eggs and buttermilk stand at room temperature 30 minute
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2
Preheat oven to 350.
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3
Lightly coat 9x5x3-inch baking pan with nonstick cooking spray; coat lightly with flour.
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4
Set aside.
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5
In bowl combine flour, baking powder, cinnamon, baking soda, salt, allspice, and nutmeg; set aside.
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6
In a large microwave-safe bowl, melt butter at 10% power (low) for 1-1/2 to 2-1/2 minutes or until very soft but not melted, checking and rearranging if necessary every 30 seconds.
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7
Add sugar; whisk until well combined.
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8
Add eggs, buttermilk, and vanilla; whisk until well mixed (mixture may look curdled).
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9
Add flour mixture.
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10
Whisk until combined.
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11
Fold in sweet potato.
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12
Spoon into prepared pan and spread evenly.
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13
Bake 65-70 minutes or until top springs back when lightly touched and split in top appears dry.
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14
Cool on wire rack 10 minute
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15
Remove from pan.
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16
Cool completely, about 2 hours.
