01 -  1 lb large shrimp, peeled and deveined 
 02 -  4 tbsp unsalted butter, divided 
 03 -  2 tbsp olive oil 
 04 -  4 garlic cloves, minced 
 05 -  1/4 cup dry white wine or chicken broth 
 06 -  2 tbsp freshly squeezed lemon juice 
 07 -  1/4 tsp red pepper flakes (optional) 
 08 -  2 tbsp chopped fresh parsley, plus more for garnish 
 09 -  Salt and pepper to taste 
 10 -  4 thick slices French or Italian bread 
 11 -  Garlic butter (softened butter mixed with minced garlic and parsley)