*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
**Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
(-)Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
Beat flour, brown sugar, pumpkin, 1/2 cup butter, eggs, cinnamon, vanilla extract, baking soda, nutmeg, ginger, and baking powder together in a large bowl using an electric mixer on medium speed until batter is evenly combined, about 2 minutes. Fold pecans into batter and spread into the prepared baking pan.
Bake in the preheated oven until edges are lightly browned, 20 to 25 minutes. Remove from oven and cool.
Beat 2 tablespoons butter and confectioners' sugar together in a bowl using an electric mixer until smooth; beat in orange juice and orange zest until frosting is light and spreadable. Spread frosting onto cooled bars.