Preparation Preheat oven to 350°F. Butter and flour 15x10x1-inch baking sheet. Place 2 cups flour in medium bowl; transfer 2 tablespoons flour to small bowl and reserve. Add spices, baking soda, and salt to flour in medium bowl; whisk to blend. Using electric mixer, beat butter, brown sugar, and 6 tablespoons sugar in large bowl until fluffy. Beat in eggs, 1 at a time, then molasses. Add dry ingredients to butter mixture and beat to blend. Spread batter evenly in prepared pan. Sift reserved 2 tablespoons flour evenly over batter, then sprinkle evenly with remaining 1 1/2 tablespoons sugar. Bake gingerbread until golden brown and tester inserted into center comes out clean, about 22 minutes; cool completely in pan on rack. Cut gingerbread crosswise into 4 strips, then cut each strip into 6 pieces, forming 24 bars, each about 31/2x13/4 inches. DO AHEAD: _Can be made 2 days ahead._Store airtight at room temperature.
Preparation Preheat oven to 350°F. Butter and flour 15x10x1-inch baking sheet. Place 2 cups flour in medium bowl; transfer 2 tablespoons flour to small bowl and reserve. Add spices, baking soda, and salt to flour in medium bowl; whisk to blend. Using electric mixer, beat butter, brown sugar, and 6 tablespoons sugar in large bowl until fluffy. Beat in eggs, 1 at a time, then molasses. Add dry ingredients to butter mixture and beat to blend. Spread batter evenly in prepared pan. Sift reserved 2 tablespoons flour evenly over batter, then sprinkle evenly with remaining 1 1/2 tablespoons sugar. Bake gingerbread until golden brown and tester inserted into center comes out clean, about 22 minutes; cool completely in pan on rack. Cut gingerbread crosswise into 4 strips, then cut each strip into 6 pieces, forming 24 bars, each about 31/2x13/4 inches. DO AHEAD: _Can be made 2 days ahead._Store airtight at room temperature.