1) Place an oven rack in the centre of the oven. Preheat the oven to 200°C, gas mark 6
2) Spray a baking sheet with cooking spray. Lay the pancetta in a single layer on the prepared baking sheet and bake for 10 to 12 minutes until crispy and brown. Drain on kitchen towels.
2) In a medium bowl, combine the eggs, Gorgonzola, lemon zest, mayonnaise, and chives. Season with salt and pepper, to taste, if using. Spread the mixture evenly over 3 slices of the bread. Crumble the pancetta and sprinkle over the egg mixture. Place the remaining bread slices on top.
3) Cut the sandwiches in half and arrange on a serving platter.