Slow Cooker Whole Chicken

Bahan-bahan (4 porsi)

• 6 celery ribs (cut into 2-inch pieces)
• 2 carrots (peeled and cut into 1 ½ inch pieces)
• 1 red onion (peeled and cut into 8 wedges)
• 8 ounces red potatoes (cut into 1-inch pieces)
• 5 cloves garlic (peeled and smashed)
• 4 rosemary (sprigs)
• 4 thyme (sprigs)
• 2 teaspoons kosher salt (plus more for seasoning)
• 1 ½ teaspoons paprika
• ½ teaspoon black pepper (plus more for seasoning)
• ½ teaspoon dried thyme (or 1 teaspoon chopped fresh)
• 4 teaspoons olive oil (plus more for brushing)
• 4 to 5- pound chicken
• 2 tablespoons unsalted butter
• 2 tablespoons all-purpose flour