Begin by combining the flour, baking soda, salt, ginger, cinnamon and cloves in a large bowl. Whisk to combine and set aside.
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Melt the butter in a large microwave-safe bowl.
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Whisk in the brown sugar, molasses, and boiling water. When the mixture is lukewarm, whisk in the egg. (If the mixture is too hot, it will cook the egg.)
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Add the dry ingredients.
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Whisk until there are no more lumps.
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Pour the batter into the prepared pan.
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Bake for about 35 minutes.
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Let cool slightly, then slice and serve warm with a sprinkling of powdered sugar, sweetened whipped cream, or vanilla ice cream.