Spicy Buffalo Chicken Burgers

Ingredients

• 1/4 cup milk
• 1/8 teaspoon salt
• 1/3 cup fresh breadcrumbs (plain, see note above)
• 24 ounces ground chicken
• 1/2 cup hot sauce (such as Tabasco, divided)
• 4 tablespoons unsalted butter (melted and cooled)
• 2 ounces blue cheese (crumbled)
• 1/2 cup mayonnaise
• 1 teaspoon vegetable oil
• 4 hamburger buns
• 2 stalks celery (finely chopped, about 2/3 cup)
• iceberg lettuce (for garnish, optional)
• tomato (for garnish, optional)