Place the toasted hazelnuts into the bowl of a food processor, fitted with a blade attachment. Add the baking powder, baking soda, cinnamon, salt, ginger, nutmeg, clove, light & dark brown sugar and seal with its lid. Pulse the mixture several times, to start to break up the hazelnuts into a fine powder. Having added the spices and sugars will prevent the hazelnuts from being ground into nut butter while pulverizing the nut to a fine flour. This will also mix the baking powder, baking soda, and salt well into the final mix. Add in the remaining flour, and pulse until the dry ingredients are uniform throughout the mixture.