Fudgy Pumpkin Chocolate Chip Bars (Pumpkin Blondies)

Bahan-bahan (12 porsi)

• 1 cup butter ((2 sticks))
• 1 tablespoon pumpkin pie spice*
• 1 cup granulated sugar
• 1 cup brown sugar (packed)
• 1 (8-oz) cup pumpkin (canned (not pumpkin pie filling))
• 2 teaspoons vanilla (I like Mexican vanilla)
• 1/2 teaspoon kosher salt
• 1 large egg
• 2 cups all purpose flour (spooned and leveled)
• 1 teaspoon baking powder
• 1 cup semisweet chocolate chips
• 1 cup dark chocolate chips