Halve the avocados and remove the stone with a knife. Scoop a bit of flesh out of the centre of each avocado to create a well. Put the avocado halves on a baking tray lined with parchment paper and crack an egg into each well.
Sprinkle the Grana Padano on top, season with a pinch of salt and pepper, and drizzle with of olive oil. Bake in a preheated oven at 180 °C for 10-15 minutes.
Serve the warm avocados garnished with Grana Padano shavings and chopped chives, accompanied by smoked salmon and fresh baby spinach.