Preheat oven to 180c. Add into the food processor the leek, dill, parsley, spinach, mint, and ss high speed to chop.
Add fresh spinach to the mix and press the button at high speed.
In a large skillet add the mix with a tablespoon of olive oil and oregano and stir until withered. Season with salt and pepper
Spread butter on both sides of the pieces of bread and place into a skillet. Divide the mixture and add the Spanakopita filling.
Top off the filling with the grated Kefalotyri. Cover the Toastie with the other piece of bread. Cook on medium heat until the bread turns golden brown.
Place into the oven for 5 to 8 minutes until the cheeses have melted. Serve hot.