Preheat the oven to 400°F (200°C).
Peel the potato and cut it into thin strips to make chips.
Place the potato strips in a bowl, add vegetable oil and salt, and toss to coat evenly.
Spread the potato strips in a single layer on a baking sheet lined with parchment paper.
Bake the chips in the preheated oven for 15 minutes or until golden and crispy, turning halfway through baking.
While the chips are baking, lightly toast the bread slices until golden brown.
Spread 1 tablespoon of mayonnaise evenly on three slices of the toasted bread.
On one mayonnaise-coated slice, layer 2 slices of turkey breast, 2 leaves of lettuce, and 2 slices of tomato.
Top with another slice of toasted bread, mayonnaise side down.
Spread the remaining mayonnaise on the top of this slice, then layer 2 slices of cooked beef bacon, 2 slices of turkey breast, 2 leaves of lettuce, and 2 slices of tomato.
Place the last slice of toasted bread on top to complete the sandwich.
Secure the sandwich with toothpicks at each corner and cut diagonally into quarters.
Serve the club sandwich with the freshly baked chips on the side.