In a large pot of boiling water cook the spaghetti according to the package instructions, drain pasta and reserve 1 cup of pasta water. Set aside.
In a large pan over medium high heat, melt 2 Tablespoons of butter. Add in the shrimp, salt, crushed red pepper and cook until shrimp is a pink opaque color, about 3 minutes. Then remove the shrimp from the pan into a bowl and set aside.
Add the other 2 Tablespoons of butter into the pan along with the garlic and cook until fragrant, about 1 minute.
Then add in the lemon juice, pasta water, parmesan cheese, and flour and stir to combine.
Next, add in the cooked pasta and shrimp and toss everything together with the sauce.
Finally, serve in a bowl, top with additional fresh parmesan cheese and fresh parsley and enjoy!
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Notes
You can store any leftovers from this garlic shrimp spaghetti in an airtight container in your fridge for 3-4 days. You can also freeze this recipe for up to 1 month.To reheat, thaw to fridge temperature and then you can heat on the stovetop over medium heat or in your microwave until everything has warmed through.