Bring a pot of salted water large enough to easily hold the cubed sweet potatoes to a boil. Add the potatoes and boil for about 10 to 15 minutes until tender.
Drain the potatoes and return them to the pot you cooked them in. Place the potatoes back on the heat (medium) for a couple of minutes to remove some of the excess starch and moisture. Be sure to stir the potatoes while this is happening so they don't burn.
Using your favorite mashing technique, mash the potatoes to desired consistency.
Add the butter and minced chile, taste and adjust seasonings with salt and pepper.