Roasted Garlic Mashed Potatoes with whites

2 lbs potatoes 1 head garlic 1 tablespoon olive oil 1/4 cup sour cream 4 tablespoons butter milk or cream, if needed salt white pepper 1 Separate head of[...]

1 head of garlic , whole 1 white onion, sliced thin 1/4 cup pure olive oil salt and pepper 2 lbs yukon gold potatoes 1 cup unsalted butter 1 1/2 cups heavy[...]