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Combine flour, baking soda, spices and salt.
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In another bowl, mix butter with white and brown sugar until fluffy (2-3 minutes). Add egg yolk and vanilla and mix.
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Add molasses and mix for a few seconds.
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Add flour mixture and beat until just incorporated.
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Roll 1 tablespoon of dough at a time into balls. Roll in granulated sugar and place on baking sheet lined with parchment paper, about 2 inches apart.
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Bake in preheated 375 F (175 C) oven for about 10 minutes. Take out of the oven when centers of cookies are still soft and edges have begun to set. Be careful not to overbake the cookies.