Stovetop Beer Mac And Cheese

Name: Stovetop Beer Mac And Cheese
Ingredients: 2 cups elbow macaroni; ½ cup sour cream; 1 large egg; ⅔ cup pale ale beer; 1 Tbsp cornstarch; 4 Tbsp unsalted butter; 2 Tbsp flour; 8 oz cheddar cheese, fresh grated (pre-shredded has additives that prevents it from melting properly); ½ tsp black pepper; ½ tsp smoked paprika; pinch cayenne pepper; ¼ tsp salt