First caramalized the onions by thinly slicing the onion. I use a food processor. Then add butter and oil to a pan on medium- med/low pan. Add onions, sugar, pepper, and bullion. Stir and let them cook until light brown and fluorescent. Set aside (10 ish min).

Now cook package mashed potatoes as on box, but add more milk/ cream in place of some of the water. I would do 1/2 water and half dairy.

Now stir in all of the contents from the onions including the oil & serve!

Side note: I tried this with garlic in the mashed potatoes and it was even better! Yum