Peel and cut potatoes into quarters. Place potatoes in a large pot. Cover potatoes with water and add 1-1/2 tablespoons salt.
Bring potatoes to a boil over medium heat. Cover with lid slightly ajar and cook until done (about 20 minutes).
Remove the potatoes from the heat and drain off the water.
Using a potato masher, mash potatoes until all chunks have been removed.
Add butter, cream, half-and-half, mascarpone cheese, thyme and salt and pepper.
Continue to mash and stir until the potatoes are creamy. Serve while hot.
Recipe by Grateful | makeitgrateful.com at https://www.makeitgrateful.com/living/celebrate/thanksgiving/thyme-mashed-potatoes-mascarpone-cheese/