2/3 C. butter
1 8oz cream cheese
1 1/2 c. shredded cheddar cheese
1 green pepper finely chopped
1 bunch green onions
2/3 c. parmesan cheese
1/2 c. milk
1 1/4 tsp salt
Boil potatoes until tender, drain, mash. Add butter and crem cheese, beat at medium speed until smooth. stir in 1/2 of the cheddar cheese and next 6 ingredients. Spoon into lightly greased 9 x13 pan. Cover and chill if desired.
Remove from refrigerator and let stand at room temp for 30 min. Bake at 350 for 40 min or until heatted. Sprinkle with remaining cheddar cheese and bake for 5 minutes or until cheese is melted.
I love this because it is so good and can be made ahead of time.