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Preheat oven to 425 degrees F.
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Cook pasta al dente. Reserve 1/4 cup pasta water and drain pasta; set aside.
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In a large bowl, combine sour cream, cream cheese, Parmesan, lemon juice, lemon zest, onion powder and garlic. Mix to combine. Add pasta a mix to coat pasta.
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Stir in spinach, artichokes, pasta water, salt, pepper, and 1/2 cup mozzarella.
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Place mixture into a greased 9″ x 13″ baking dish and top with remaining mozzarella.
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Bake for 15 to 18 minutes until top is golden brown.