Peel, rinse and thinly slice either Russet or Yukon Gold potatoes.
Place COLD water about 2" above the potatoes in your pot.
Once it reaches a boil on high heat, set timer for 15 minutes and reduce heat to medium-high.
Once potatoes flake apart with a fork, drain.
Warm up butter and cream with salt and pepper in microwave for about a minute.
Add to a mixing bowl and add potatoes.
Whip in high speed with a hand mixer.
Spread on top of pie evenly.