Cake of the week: pumpkin chocolate chip bars with pumpkin buttercream

Ingredients

• 2 cups flour
• 2 teaspoons baking powder
• 2 teaspoons cinnamon or pumpkin pie spice
• 1 teaspoon baking soda
• 1 teaspoon salt
• 4 eggs
• 2 cups cooked pumpkin
• 1 1/2 cups sugar
• 1 cup oil or 1 cup butter
• 2 cups semi sweet chocolate chips
• 2 sticks of unsalted butter at room temp
• 1/2 cup pumpkin puree
• 1 teaspoon cinnamon
• 1/2 teaspoon ginger
• 1/2 teaspoon salt
• 1 teaspoon vanilla extract
• 2 libras confectioner's sugar