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In a large mixing bowl, mix butter with electric mixer for 30 seconds.
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Add both sugars and cream until light and fluffy, about 3 minutes.
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Add molasses, egg and vanilla and mix until smooth.
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In a large mixing bowl, whisk together flour, soda, cornstarch and spices.
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Add dry ingredients to the wet ingredients and mix until incorporated. The batter will be thick and sticky.
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Cover and chill the dough for at least 2 hours for up to 5 days.
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Preheat oven to 350 degrees F.
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Line a baking sheet with parchment paper or silicone baking mat.
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Scoop tablespoon size balls of dough and roll in sugar.
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Place on a baking sheet leaving 2 inches of spaces between them.
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Bake for 9 to 11 minutes (10 minutes was the magic number for me).
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Cool on sheet for 2 minutes, transfer onto a cooling rack.