preheat the oven to 300°F

Peel and quarter potatoes and boil until cooked.

Brown the hamburger on medium high heat and then add the mushrooms and onion and cook the onion until it's clear. Drain the fat.

To the hamburger add the beef bouillon packet, HP sauce, Worcestershire sauce, and barbecue sauce. Add the can of peas and mix well.

Pour all of the contents into a casserole dish and spread evenly. On the top spread the the mashed potatoes evenly. Dot some margarine on top.

Bake for 30 minutes.