01 -
Preheat oven to 175°C. Grease and flour a 23×33 centimetre baking pan.
02 -
In a large mixing bowl, whisk together flour, baking soda, cinnamon, nutmeg, cloves, and salt until evenly blended.
03 -
In a separate bowl, whisk granulated sugar, vegetable oil, and eggs until smooth and pale. Incorporate pumpkin puree until homogeneous.
04 -
Gradually fold the dry mixture into the wet ingredients, mixing gently until just combined. Avoid over-mixing.
05 -
Stir in chopped walnuts or pecans if desired, distributing evenly.
06 -
Transfer batter into the prepared pan, spreading evenly. Bake for 30 to 35 minutes, or until a toothpick inserted in the centre emerges clean.
07 -
Let the baked bars cool completely in the pan on a wire rack before applying frosting.
08 -
Beat together softened butter and cream cheese in a medium bowl until smooth. Gradually add powdered sugar and brown sugar, mixing until fully incorporated. Stir in vanilla extract.
09 -
Add milk or cream, one tablespoon at a time, beating until the frosting reaches a smooth, spreadable consistency.
10 -
Spread frosting evenly over the cooled pumpkin bars. Cut into portions and serve.