this is the definitive Red Lobster Mashed Potato Recipe:

Red Lobster White Cheddar Mashed Potatoes 2 pounds potatoes, peeled and quartered 2 ounces butter, unsalted, room temperature 1/3 cup heavy cream 1/4 cup sour cream 4 ounces white Cheddar cheese, grated 1 teaspoon salt 1/2 teaspoon white pepper Place potatoes in pot and cover with cold water. Bring to a boil and simmer until fork tender. Drain completely. Mix potatoes with an electric mixer until smooth. When smooth, add butter and blend. Add cream, a little at a time and beat; add sour cream and blend. Add cheese, salt and pepper and blend again. From http://www.recipegoldmine.com If this isn't the one you have been looking for, let me know and I will comb more resources.