In a large, deep skillet or pot, melt butter over medium heat. Add minced garlic and red pepper flakes, cooking for about 1 minute until fragrant (don't let the garlic brown!).
Add the shrimp to the pot and cook for 2-3 minutes per side until pink and cooked through. Remove shrimp and set aside on a plate.
Pour the chicken broth into the same pot, scraping up any browned bits from the bottom. Bring to a boil.
Break the pasta in half and add it to the boiling broth. Stir occasionally and cook for about 8-10 minutes, until pasta is almost tender.
Reduce heat to low and stir in the heavy cream and Parmesan cheese. Continue cooking for 2-3 minutes until the sauce thickens slightly.
Return the shrimp to the pot along with lemon juice. Toss everything together and cook for another minute to heat the shrimp through.
Season with salt and pepper to taste, garnish with fresh parsley, and serve immediately while it's nice and creamy!