Scalloped Potatoes with sauce

5 large yukon gold potatoes , peeled and sliced thinly 1 small onion , finely chopped 1 garlic clove , finely minced 3 tablespoons butter 3 tablespoons flour[...]

6 tablespoons margarine 1/2 cup flour 2 large onions , chopped 1/2 cup mayonnaise 1/2 teaspoon salt 28 ounces chicken stock 9 -10 large idaho potatoes ,[...]

6 tablespoons margarine 1/2 cup flour 2 large onions , chopped 1/2 cup mayonnaise 1/2 teaspoon salt 28 ounces chicken stock 9 -10 large idaho potatoes ,[...]