1-Preheat the grill: Preheat grill to medium high heat, clean and oil grates.

2-Flatten the chicken: Flatten chicken to even 1/2 inch thickness using a meat mallet or rolling pin.

3-Season the chicken: Season generously with salt, pepper, paprika or garlic powder, then brush with olive oil.

4-Grill the chicken: Grill for 6-7 minutes per side, flipping once, until internal temperature reaches 165°F.

5-Melt the cheese: In the last minute, place two slices of Swiss cheese on each breast and close lid to melt.

6-Rest the chicken: Rest chicken off heat for 5 minutes to redistribute juices.

7-Toast the buns: Toast brioche buns cut side down on grill for 1-2 minutes until golden.

8-Mix the spread: Whisk together 2 parts mayonnaise and 1 part Dijon mustard; spread on each bun half.

9-Assemble the sandwich: Layer bottom bun with lettuce, tomato, cheesy chicken, smoked ham, then top bun.

10-Pan toast the sandwich: In a skillet with butter over medium heat, toast assembled sandwich for 1-2 minutes per side until crispy and cheese is fully melted.