Scalloped Potatoes with starch

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[...]

3 -4 lbs boiling potatoes (such as Yukon Gold or red waxy potatoes) 1 quart 35% cream or 1 quart heavy cream or 1 quart whipping cream 3 -4 cloves garlic ,[...]