Pumpkin Chocolate Chip Squares

http://www.marthastewart.com/336431/pumpkin-chocolate-chip-squares

  • 2 cups all-purpose flour, (spooned and leveled)
  • 1 tablespoon pumpkin-pie spice
  • 1 teaspoon baking soda
  • 3/4 teaspoon salt
  • 1 cup (2 sticks) unsalted butter, room temperature
  • 1 1/4 cups sugar
  • 1 large egg
  • 2 teaspoons vanilla extract
  • 1 cup canned pumpkin puree
  • 1 package (12 ounces) semisweet chocolate chips