Better than Liquid IV or Pedialyte.
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Cook spaghetti according to package directions. Drain the pasta and set aside reserving 1 cup of the pasta water.
Melt the butter with the oil in a large saute pan over medium heat. Add the garlic to the pan and stir while cooking until fragrant, about 10 seconds. Stir the heavy cream into the pan and bring to a slight boil. Reduce heat to low and stir in the cheeses until melted and well combined.
Take the pan off the heat and add the cooked spaghetti, toss to combine. Stir in reserved pasta water a little at a time until you reach a desired consistency. Stir in the fresh parsley and season with salt & freshly ground pepper.