Scalloped Potatoes without sausage cream

3 cups leeks , washed very well and then thinly sliced (about 6 large, white and pale green parts only) 1/2 cup unsalted butter 3 1/2 cups whole milk 6[...]

1 medium onion , chopped 1 tablespoon vegetable oil 3 garlic cloves , finely chopped 2 sweet potatoes , peeled and cut into 1/4 inch slices 2 baking potatoes[...]

2 tablespoons butter , unsalted 1 tablespoon olive oil 1 tablespoon fresh parsley , chopped 1/2 teaspoon thyme salt pepper 2 tablespoons flour 2 cups milk 3[...]

3 lbs yukon gold potatoes , peeled and sliced paper thin 3 cups milk 1 garlic clove 3 tablespoons unsalted butter , softened coarse salt & freshly ground[...]