Prepare the Bread and Filling: Slice each bread section horizontally. Spread a thin layer of yellow mustard on the bottom half of each piece of bread.

Layer the Sandwich: On the bottom half of each sandwich, place one slice of Swiss cheese. Layer the roasted turkey breast slices, followed by the sliced turkey. Arrange the dill pickle slices evenly over the meat. Top with a second slice of Swiss cheese and the top half of the bread.

Press the Sandwich: Lightly spread softened butter on the outside of both the top and bottom of each sandwich. Heat a large skillet, griddle, or a panini press over medium heat.

Grill: Place the sandwich on the heated surface. If using a skillet, use a press or a heavy object (like a foil-wrapped brick or a smaller skillet) to press down firmly on the sandwich. Cook for 4-5 minutes per side, or until the bread is golden brown and crispy and the cheese is completely melted.

Serve: Remove the Cuban sandwich from the press. Slice it diagonally and serve immediately while it's still warm and the cheese is gooey.