Place the sweet potatoes in a large pot and cover with cold water. Bring the water to a boil and cook until the potatoes are fork tender, approximately 15-20 minutes. Once the potatoes are cooked, drain thoroughly and return to the pot.

Add butter, cream cheese, and half & half to the sweet potatoes and mash with an immersion blender or a hand-held mixer. For a thinner consistency, add more half & half, if desired.

Once the potatoes are creamy, stir in thyme leaves, cinnamon, and allspice until well blended. Season with salt and pepper, to taste, and serve immediately topped with a spoonful of whipped cream cheese and/or toasted walnuts, if desired. Enjoy!