Preheat oven to 350 degrees F. Thoroughly grease a 9x 9-inch baking pan with 2 teaspoons butter. Sprinkle with cocoa powder, tilt pan in different directions to distribute cocoa, and tap out excess. Set cocoa coated pan aside. In a large mixing bowl, Sift together flour, baking powder, baking soda, cinnamon, nutmeg, allspice, and salt. Set aside. In another large mixing bowl, beat the 1/2 cup butter until creamy. Gradually add the white and brown sugar, beating until fluffy. Add the eggs, one at a time, beating well after each addition. Beat in orange zest,  vanilla, carrots, chocolate and walnuts. Blend in the flour mixture,  mixing until combined. Spoon batter into baking pan.

Bake 25 to 28 minutes or until a cake tester inserted in center comes out clean and the edges of the bars pull away from the sides of the pan. Cool the bars in the pan on a rack. Spread with orange glaze while they are still warm, let cool, then cut into individual bars.
 
 Orange Glaze: Combine powdered sugar, orange zest and 1 1/2 tablespoons of the orange juice. Mix well, adding enough orange juice to make a spreadable consistency.
 
 Note: If any cookies are left over, store in refrigerator.
 
MAKES 18 BARS, (cut 1 1/2 x 3-inches)

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