Core the apples using an apple corer or a small round biscuit cutter.

Slice the apples horizontally into 1/2-inch thick rings to create uniform rounds.

Brush both sides of the apple rings with lemon juice to prevent enzymatic browning.

Lay half of the apple rings flat on a work surface and spread 1 tablespoon of peanut butter onto each.

Sprinkle 1 tablespoon of granola over the peanut butter on each slice.

Dust the granola with a pinch of ground cinnamon.

Place the remaining apple rings on top of the granola-covered slices to form sandwiches.

Serve immediately for optimal texture.