In a bowl, add Spinach mixture, crisp pancetta, mozzarella cheese, Italian seasoning, salt, and pepper, mix well until combined.
In a rectangular baking tin (8), add in each cavity, slice of butter, baguette slice, fill the centre with spinach mixture, then pour beaten egg on top, spreading egg evenly in each cavity.
Place in oven, and bake for 15 minutes, until golden brown and egg has cooked. Remove from heat and ready to serve.