Add the oats, milk, and pudding mix to a large microwave-safe bowl. Stir to dissolve the pudding mix. Microwave on HIGH for 1 minute 45 seconds. Stir, and microwave again for 1 minute, stirring every 15 seconds to prevent the oatmeal from bubbling over. Let the oatmeal rest for 2 minutes before topping with the chocolate chips.