Open face chunky chicken sandwich with crunchy toppings

Ingredients

• 2 chicken breast fillet, skins are trimmed off
• 1 long celery stalks chopped
• 1 long onion leek stem chopped
• 1 medium sized red onion, minced
• 1/2 cup mayonnaise
• 2 large gloves garlic minced
• 2 lettuce
• 1 small tomato sliced
• 1/2 cucumber chopped into small cubes
• 2 tablespoons French's potato sticks or any potato chips
• salt and pepper
• 2 tablespoons olive oil