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1
Set a rack in the middle level of the oven and preheat to 350 degrees.
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2
Measure the flour, nutmeg, baking soda, and salt into a mixing bowl and stir well to combine.
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3
In the bowl of an electric mixer, beat the butter and sugar together, using the paddle attachment on medium speed.
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4
Beat in the egg and continue beating until the mixture is smooth.
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5
Lower the mixer speed and beat in half the dry ingredients.
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6
When this is incorporated, slowly add the buttermilk and beat until smooth.
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7
Then beat in the rest of the dry ingredients.
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8
Remove the bowl from the mixer and stir the batter well with a rubber spatula.
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9
Scrape the batter into the prepared pan and smooth the top evenly.
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10
Bake the cake about 25 to 30 minutes, until well risen and a light golden color, and a toothpick or small knife inserted in the center emerges clean.
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11
Remove from the oven and cool on a rack for 10 minutes, then, using the paper, lift the cake from the pan onto a rack and let cool completely.
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12
To cut the bars, use the paper to transfer the cake onto a cutting board.
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13
Slide a long knife or spatula under it to loosen the paper or foil, then pull it away.
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14
Use a ruler to mark, then cut the cake into 2-inch squares.
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15
The squares will keep between sheets of parchment or wax paper in a tin or plastic container with a tight-fitting cover for several days.
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16
Freeze for longer storage.