If you don’t have a blender a great option is to melt the ice cream a little and stir it to make a milkshake. Place your ice cream in a microwave safe bowl then microwave it until it can easily be squished with a spoon about 15-30 seconds. After your ice cream is softened, add milk and any mix-ins. Another option is to put it in a jar and shake it vigorously until well-mixed.