In a large saucepan over medium heat, melt the
butter. Add the onions, including juices, and cook
until tender, about 2 minutes. Add the garlic,
white pepper, paprika, and salt and freshly ground
black pepper, to taste. Cook for a few minutes to
let the flavors bloom, and then slowly stir in the
heavy cream. Bring to a simmer, stirring
occasionally, and cook until slightly thickened,
about 8 minutes. Add the cheeses and stir until
melted, then remove from heat. Stir in the pasta
and toss until thoroughly combined. Season with
salt and pepper, to taste. Transfer to a serving
bowl and serve warm.
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