Spicy Shrimp with Creamy Polenta

Name: Spicy Shrimp with Creamy Polenta
Ingredients: kosher salt; 1 c. polenta or yellow cornmeal; 2 tbsp. butter; 1/3 c. freshly grated Parmesan; 1/3 c. freshly grated Asiago; 2 tbsp. extra-virgin olive oil; 3 cloves garlic, minced; 1/2 tsp. crushed red pepper flakes, plus more for garnish; 3 green onions, thinly sliced, whites and greens separated; 1 pt. grape tomatoes, halved; 1 lb. medium shrimp, peeled and deveined (tails left on, if desired); 2 tsp. fresh thyme leaves; 1/2 c. dry white wine; 1/2 c. chicken stock; 2 tbsp. heavy cream