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POPSSpinach Lasagna Finish this layer with half of the remaining spaghetti sauce. Add a second layer of noodles, topping with the remaining cheese mixture, spinach, and mozzarella cheese. Top with the final layer of noodles and remaining spaghetti sauce. Sprinkle the reserved Parmesan cheese over the top and bake for thirty minutes. Remove from oven and allow to set for 10-12 minutes, then slice and serve.