For potatoes, you have two options. Steaming and boiling. I still find that the boiled option is easier and gives the best result. Coo the potatoes in salted water and some black pepper. Boil until potatoes are fork-tender. About 10-15 minutes.
Drain well until all the water is removed and evaporated. Return the potatoes to the pot.
Add butter to the pot, and mash the potatoes with a hand mixer, blender (more smooth consistency) or hand masher (more rustic consistency). In batches, add warm milk and potatoes constantly whipping the potatoes until all combined and creamy.
What I like to do, is first roughly mash the potatoes with a potato masher, then add milk and whip with an electric hand mixer until creamy.
Meanwhile, cook the bacon in a pan with some brown sugar until crumbly. So it is not the most candied bacon with this amount of sugar but you can add more if you like the sweet and savory combo happening here.
Season the sweet potatoes with salt and pepper. Serve hot with bacon crumbles and fresh parsley ad more butter.