Heat the oil in a large skillet over medium heat. Add the garlic and saute for a minute. Add the spinach; saute until wilted. Remove from heat and place in a food processor to cool slightly. Add the ricotta, egg and salt to the food processor and pulse until smooth. In another bowl add the spaghetti sauce, ground beef and water.
Spread a little bit of sauce in the bottom of a 9x13 pan. Layer with three lasagna noodles and some of the spinach mixture. Repeat twice more ending with sauce and the mozzarella cheese.
Cover with foil and bake for 30 minutes. Uncover and continue baking another 10-15 minutes until the cheeses is golden brown.
Recipe by Friday is Cake Night at https://www.fridaycakenight.com/2014/06/speedy-spinach-lasagna/