Easy savoury stuffing

Ingredients

• 675-g loaf sliced white bread
• 2 tsp ground sage , or 1 tbsp packed dried sage leaves
• 1 tsp ground savory , or 2 tsp dried summer savory leaves
• 1 tsp salt
• 1/2 tsp freshly ground black pepper
• 1/2 cup butter
• 2 cups chopped onion
• 1 1/2 cups finely chopped celery , including leaves