Pumpkin Chocolate Chip Granola Bars

old fashioned oats 1/2 teaspoon pumpkin pie spice 1/2 teaspoon cinnamon 1/4 teaspoon nutmeg 1/2 teaspoon salt ¾ cup brown sugar ½ cup pumpkin puree ¼ cup applesauce ¼ cup honey 1 teaspoon vanilla extract 1 cup chocolate chips