Heat a small saucepan over medium heat. Melt butter and stir in rice to coat grains evenly. Pour in milk, pumpkin, maple syrup and seasonings. Stir well. Continue stirring occasionally over medium low heat, adding in more milk if it seems to be getting too thick. Continue stirring and adding milk for about 30 minutes or until rice is cooked thoroughly. Pour into serving dish and top with chocolate chips.