Peel and cube the potatoes. Cook them in a large pot of salted boiling water for about 15-20 mins or until tender.
In a small saucepan over medium-low heat, melt the butter and combine it with the heavy cream, milk, dried minced onion, and garlic powder.
Drain the cooked potatoes and return them to the pot. Mash them until there are no lumps and stir in the butter/cream mixture until well incorporated and the potatoes are velvety and creamy. You may need to add a bit more milk if they are too thick.
Season with salt and pepper to taste and serve while hot with an extra pat of butter and freshly chopped parsley on top.
Notes
Add enough salt to the pot of boiling water. This will make the mashed potatoes tastier.
If the mashed potatoes are too thick, you may add more milk or heavy cream until the desired consistency.
If using salted butter, taste it before adding extra salt.