Part 1:
Make the potato topping.

Place the potatoes in a large pot. Cover the potatoes with water. Bring the water to a boil. Reduce to a simmer. Cook until potatoes are fork tender, 10-15 minutes.

Drain the potatoes in a colander. Return the potatoes to the hot pot. Let the potatoes rest in the hot pot for 1 minute to evaporate any remaining liquid.

Add butter, half & half, garlic powder, salt, and pepper. Mash the potatoes and stir until all the ingredients are mixed together.

Add the parmesan cheese to the potatoes. Stir until well combined.

NOTE: Remember to set some potatoes off to the side and mash them with margarine/plant milk instead for the lactose intolerant folk.

https://www.thewholesomedish.com/the-best-classic-shepherds-pie/