This is our best version of the classic party dip. It's savory and creamy with a slight tang from sour cream and Parmesan -- so hard to resist. We like to use frozen whole leaf spinach and chop it ourselves for more control over the finished texture of the dish.
Position a rack in the upper third of the oven and preheat to 350 degrees F. Spray a 1-quart baking dish with nonstick cooking spray.
Put the cream cheese, sour cream, mayonnaise and garlic in a large bowl. Mix vigorously until combined and smooth. (If you prefer, you can use a stand mixer fitted with the paddle attachment.) Add the spinach to the cream cheese mixture, breaking it up as you add it. Add the artichokes, mozzarella and 1/2 cup of the Parmesan, mixing to combine. Season with salt and pepper. Transfer the mixture to the prepared baking dish and top with the remaining 1/4 cup Parmesan.
Bake until the dip begins to bubble, 20 to 25 minutes. Turn the oven to broil and continue to cook, keeping an eye on it so it doesn't burn, until the top is golden brown, about 5 minutes. Serve warm with crackers, chips or toasted bread.
To thoroughly dry the spinach, put the thawed spinach in a clean kitchen towel over a bowl or the sink and twist to squeeze out all the moisture.
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