Garlic Mashed Potato Gratin

5# potatoes, peeled, diced and cooked

12 cloves garlic

1 1/2 Cup heavy cream

1 C grated Parmesan cheese

4 oz cream cheese

1/2 C chives

Bring cream, Parmesan cheese and 2 Tb butter to simmer. Mash potatoes, garlic, and cream cheese until smooth. Stir in cream mixture. Stir in chives and season to taste with pepper. Dot with 1 Tb butter. Bake at 350F for ~45 minutes.