Spray a baking dish with cooking spray and preheat the oven at 175°C.
Cook and drain the lasagne noodles as per directions on the packaging.
In a bowl, stir together spinach, ricotta cheese, egg, garlic, salt, pepper, and half of the mozzarella cheese.
To assemble, place 4 cooked noodles in bottom of baking dish. Top with one-third of the Alfredo sauce (about 1/2 cup) and half of the spinach mixture. Repeat the layers once. Top with remaining 4 noodles, Alfredo sauce and 1 1/2 cups mozzarella cheese. Spray a sheet of foil with cooking spray; cover baking dish tightly with foil, sprayed side down.
Bake for 30 minutes. Uncover and bake for another 15 minutes, until bubbly around edges. Let the lasagna cool for 10 minutes before serving.
Serve with some toasted ciabatta.
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