Preheat the oven 350° Fahrenheit and line 2 baking sheets with parchment paper.
Combine flour, baking soda, salt and spices in a medium bowl. Mix well to combine and set aside.
Place butter and sugar in a bowl of an electric mixer fitted with a paddle attachment and beat over medium/high speed until light and fluffy. Add the egg, molasses, dark corn and brown sugar syrup and vanilla extract and beat until incorporated.
Add the flour/spice mixture and mix until just combined. Using a 1 1/2 tsp. cookie scoop or a teaspoon, drop cookies onto prepared baking sheet, leaving over 2 inches of space between each cookie. Sprinkle the cookies with the sugar (if using) and bake for about 12-14 minutes until cookies are crackled.
Allow cookies to cool slightly, and then remove with a spatula, transferring them to a wire rack to cool completely.