Peel the potatoes and cut them into quarters. (For larger potatoes, you may need to cut them into sixths.)
Place in a large pot and add water to 1 inch above the potatoes. Bring to a boil, then reduce heat to medium-low, cover, and simmer 15-20 minutes or until fork-tender.
Remove from heat and drain well in a colander.
Return drained potatoes to the pot, place on the stove, and heat over high heat 30 seconds - 1 minute to completely dry them. Remove from heat.
Use a potato masher to mash by hand, going around the entire pot twice.
Add the butter and half & half and mash to desired consistency. Add more liquid if necessary. *Note: Be careful not to over-mash, which will result in gummy potatoes.
Season with salt & pepper to taste.