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1
Adjust one oven rack to the upper-middle position and keep one rack at the middle position.
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2
Preheat the oven to 375F Coat an 8-inch baking dish with cooking spray.
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3
Heat 1 tablespoon of the olive oil in a medium nonstick skillet over medium-low heat.
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4
Add the onion and garlic and cook until the onion is sticky and golden brown, about 3 minutes, stirring often.
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5
Add the artichoke hearts and a few cups of the spinach, turning the mixture over until the spinach leaves wilt.
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6
Add the remaining spinach and continue to cook until all the leaves are wilted, about 5 minutes.
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7
Set aside to cool.
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8
Stir the cream cheese, mayonnaise, and 1/4 cup of the Parmesan together in a large bowl until creamy.
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9
Add the cooled spinach mixture and stir to combine.
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10
Scrape the mixture into the baking dish and sprinkle with the remaining Parmesan.
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11
Bake until the Parmesan is golden brown, about 30 minutes.
