Mix Cinnamon And Sugar Together In A Small Bowl. Spread One Tablespoon Of Peanut Butter Onto One Side Of 8 Slices Of Bread. Arrange Apple Slices On 4 Slices Of Bread. Sprinkle The Cinnamon/Sugar Mixture Evenly Over The Apples. Top With The Remaining 4 Slices Of Bread, Peanut Butter Face Down. Melt The Butter In A Large Skillet Over Medium Heat. Fry Sandwiches Until Browned, About 1 To 2 Minutes On Each Side.