Boston Market Mashed Potatoes

I found this recipe from another site that was posted by Kitchenmama on AOL

4 lbs. Idaho potatoes, peeled and sliced. (it makes them taste better if you
leave little flecks of the skin on.)
1/2 small yellow onion, diced
1 lb. butter
whole milk or cream
salt and pepper to taste

Boil or steam potatoes until very tender. Steam onions or cook them in the microwave with 1 T. of water until they appear clear. Place cooked potatoes and onions into bowl on mixer or hand mixer. Add abutter and let it melt. Mix on medium speed with wire attachment or hand mixer. As potatoes become mashed, add milk 1 tablespoon at a time to reach desired consistency. Season with salt and pepper.
ENJOY EVERYONE!!!!