In 2-quart saucepan, melt butter over medium heat. Cook and stir garlic in butter 1 minute. Stir in flour with whisk until smooth. Gradually add half-and-half and cream. Heat to boiling. Reduce heat to low; cook about 5 minutes, stirring frequently, until sauce is slightly thick. Stir in salt, pepper and nutmeg. Slice potatoes into 1/8-inch-thick slices.