Preheat your broiler. Line a baking sheet with foil.

Cut the ham slices into pieces about the same size as the crackers. Cut each cheese slice into quarters.

Spread about a 1/2 teaspoon of apple butter on half of the crackers. Layer the ham & cheese on top of the apple butter crackers. Add a spinach leaf to the layers if desired - I did spinach on half of mine, half without. Top with the remaining crackers to form 'sandwiches'.

Place the sandwiches on the baking sheet & heat under the broiler for just a couple of minutes; until the crackers start to golden & the cheese begins to melt.