HEAT oven to 350°F. MIX flour, baking powder, baking soda, cinnamon, ginger, salt and nutmeg in medium bowl.
BEAT pumpkin, granulated sugar, oil and eggs in mixer bowl on low speed until blended. Gradually ADD flour mixture, beating until batter is smooth. SPREAD in greased 15 1/2 x 10 1/2 x 1-inch jelly-roll pan.
BAKE in 350°F oven until wooden pick inserted in center comes out clean, 20 to 25 minutes. COOL completely in pan on wire rack.
For cream cheese frosting: BEAT 8 oz. cream cheese, 1/2 cup unsalted butter and 1 tsp. vanilla in mixer bowl until smooth. Gradually ADD 3 cups powdered sugar, beating until light and fluffy.
FROST pumpkin bars; GARNISH with pecans. CUT into 40 squares, about 2 x 2 inches each.
- One Tbsp. pumpkin pie spice can be substituted for the cinnamon, ginger and nutmeg.