Mashed potatoes with zesty chicken

I usually cook mashed potatoes by boiling the potatoes and then mashing them. Apparently, that is not true mashed potatoes. My friend Nathan told me that you are supposed to add milk, butter, black

Pepper, etc. I tried it and he was right! It came out so much better! 

 The chicken is a simple baked chicken breast, with a sauce made with mustard and black pepper,etc. It turned out so so good!!!!