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Preheat the oven to 356°F/180°C.
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Add butter and chocolate into a large bowl. melt together in the microwave in 30 sec intervals, until the butter and chocolate have melted, stirring between intervals to mix them.
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Add salt, vanilla extract, cinnamon, clove, and ginger, whisk batter together to incorporate.
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Whisk in one egg at a time.
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Add the flour into the mix and mix just to combine everything. Don't over mix the batter.
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Pour batter into a parchment lined 8X2 inch (20X20 cm)baking sheet.
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Bake for 15-20 min, or until edges are firm and the middle part is still a bit soft.
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Let cool in room temperature.