In a medium sized skillet over medium low heat add the butter. Cook until butter starts to foam, and turn brown. About 3-4 minutes.
Add the shrimp and season with salt and pepper. Turn the heat to medium high. Add the garlic. Cook until the shrimp turns pink about 2 minutes each side. Add the lemon juice, and red pepper flakes. Garnish with parsley and toss with pasta if desired. Serve immediately .