Cut fresh spinach in half and cook in a large pot of boiling water for 30 seconds until wilted. Rinse the spinach under running cold water until cool to handle. Drain it in a colander and squeeze out excess water. Set aside.
In a large skillet, melt butter over medium-high heat until melted butter turns bubbly, about 1-2 minutes. Sauté onion and garlic until fragrant, about 2 minutes.
Add flour and stir well to combine. Stir in heavy cream and Parmesan. Stir constantly and turn the heat down to medium. Bring the mixture to a simmer until smooth and thickened, about 4-5 minutes. Season with salt and pepper to taste.
Stir in spinach and toss well to coat. Cook for 1 -2 minutes until heated through. Serve warm with extra Parmesan on top, if desired.
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