Shrimp Scampi Risotto

Name: Shrimp Scampi Risotto
Ingredients: 3 tbsp. butter, divided; 1 large onion, diced; 4 cloves garlic, minced and divided; 1 c. arborio rice; 4 c. low-sodium chicken broth; 1.5 c. dry white wine, divided; 2 tbsp. freshly chopped parsley, plus more for garnish; 1 tsp. crushed red pepper flakes; 1 lb. medium shrimp, peeled and deveined; 1 c. freshly grated Parmesan