Crowd Pleasing Chicken Sandwiches (แซนด์วิชไก่เพื่อมวลชน)

Ingredients

• Bread 30 slices
• Unsalted butter 200 g
• Shredded chicken 500 g
• Celery (finely chopped) 60 g
• Green onions (chopped) 3 tbsp
• Pickles (chopped) 3 tbsp
• Mayonnaise 200 g
• Greek yogurt 100 g
• Mustard 2 tsp
• Lemon juice 1 tbsp
• Garlic powder ½ tsp
• Paprika ½ tsp
• Salt ½ tsp
• Black pepper ¼ tsp