Place peanut butter, honey, cinnamon and salt in a small bowl. Stir until smooth and well combined. This mixture gives the sandwich a creamy texture with a gentle sweetness.

Spread softened butter evenly over one side of each bread slice. Cover the edges carefully because they become wonderfully crisp during grilling. Avoid using too much butter, which can make the bread greasy.

Turn two bread slices over so the unbuttered sides face upward. Spread the peanut butter mixture evenly across each slice. Leave a small border around the edges to prevent filling from escaping.

Arrange thin banana slices over the peanut butter. Keep them in one even layer for easy grilling. The banana adds natural sweetness and creates a soft, creamy center.

Place the remaining bread slices on top. The buttered sides should face outward. Press each sandwich gently with your hand. Do not flatten them too much or the filling may squeeze out.

Place a nonstick skillet over medium-low heat. Let it warm for about one minute. Gentle heat helps the bread become golden without burning the butter before the center becomes warm.

Place both sandwiches in the warm skillet. Cook for about three minutes on the first side. Flip carefully with a spatula and cook the other side until golden and crisp.

Press the sandwiches gently with the spatula. The bread should feel crisp outside and soft inside. If the bread browns too quickly, lower the heat immediately.

Transfer the grilled sandwiches to a cutting board. Let them rest for one minute before slicing. Cut them diagonally and serve while warm for the best texture and flavor.