Preheat oven to 350°F.
Line a standard size half sheet pan (approximately 12 x 18 x 1 inches) with parchment paper and spray with cooking spray. Ensure that the parchment paper extends about two inches longer on the each end. In a small bowl combine the flour, baking powder, ginger, cinnamon, cloves, nutmeg and salt. Set aside.
3/4 cup all purpose flour, 1 teaspoon baking powder, 1 teaspoon cinnamon, 1 teaspoon ground ginger, 1/4 teaspoon ground cloves, 1/4 teaspoon ground nutmeg, 1/4 teaspoon salt
Add the eggs and brown sugar to the bowl of an electric mixer fitted with a paddle. Beat on high speed for 4-6 minutes or until light and fluffy.
4 eggs, 1/4 cup brown sugar
Slowly mix in the molasses, melted butter, and vanilla extract.
1/2 cup molasses, 2 teaspoons unsalted butter, 1 teaspoons vanilla extract
Reduce the speed to low and gradually add the flour mixture until just incorporated, being careful not to over-mix.
Pour the batter into the prepared pan and spread out evenly with a spatula.
Place the cake into the oven and bake for 9 to 11 minutes, or until the middle of the cake springs back when lightly touched.
Remove the cake from the oven and fold one end of the parchment over the cake and roll up. Place the rolled cake on a cooling rack and cool completely, about an hour.