In one sentence, describe what the following article is about:

Pour in 2 tbsp (30 mL) of water for every 16 ounces (450g) of marshmallows you use. Find out if your bowl is safe to use in a microwave by checking its underside. Check for a label or symbol with wavy lines. These indicate that the bowl is safe to use. Place your bowl into the microwave and turn the dial to the high setting. Keep an eye on the marshmallows at the timer on the microwave runs down. When the 30 seconds are up, take the bowl out the microwave. You might need to wear oven gloves just in case the bowl is too hot. Dip your spoon into some solid vegetable shortening before you stir the mixture. The shortening will make it much easier for you to stir the marshmallows without the spoon getting stuck. Scrape any marshmallow stuck to the sides of the bowl back into the mix. You might need to microwave the marshmallows at 30-second intervals a few times before they're melted enough to be used as icing. Remember to keep stirring the mixture rigorously before adding the bowl back to the microwave. The mix shouldn't be very liquid when finished. It should be very pliable but it should not be runny. If you want to add a bit of extra flavor to your melted marshmallow icing, simply pour in any flavorings. Use vanilla extract or food coloring. Pour a few drops of your chosen flavoring into the bowl and use the spoon coated in vegetable shortening to stir the mixture. Powdered sugar will add that sweetened taste to your melted marshmallow icing. Once again, use the spoon coated in vegetable shortening to mix the ingredients in the bowl. You might have to coat another spoon in vegetable shortening as the mix turns to dough. Coat your hands and the table with the vegetable shortening to make it easier to work with the dough. As you knead, add some powdered sugar to the dough. Keep adding powdered sugar until the dough turns into a stiff ball. Rub some vegetable shortening on the melted marshmallow ball before wrapping it in plastic wrap. The next day, unwrap the ball and use it as icing for your cake. If you don't need it for a few days, place the melted marshmallow ball in the fridge.

Summary:
Place your marshmallows and water in a microwave-safe bowl. Microwave the marshmallows and water for 30 seconds at the high setting. Stir the mix with a spoon coated in solid vegetable shortening. Repeat the microwave and stirring process until the marshmallows are melted. Add any flavorings you'd like to the bowl and stir. Pour 65 grams (2.3oz) of powdered sugar into the bowl and mix. Knead the marshmallow mix on a clean work surface. Store the ball in plastic wrap overnight at room temperature.