Shrimp and Grits Casserole

Name: Shrimp and Grits Casserole
Cook time: 1 h
Total time: 1 h
Cuisine: American, Southern
Ingredients: 2 cups whole milk; 2.25 cups heavy cream, divided; 1 cup uncooked quick-cooking grits; .25 cup butter; 1 large egg, lightly beaten; 8 ounces sharp Cheddar cheese, shredded (about 2 cups); 1.5 teaspoons kosher salt, divided; 5 thick-cut bacon slices, chopped (about 1 cup); .5 cup finely chopped red onion (from 1 small onion); .5 cup finely chopped red bell pepper (from 1 small bell pepper); 2 garlic cloves, minced (about 1 Tbsp.); .33 cup all-purpose flour; 1 pound medium peeled, deveined raw shrimp; .5 cup (4 oz.) dry white wine; 1 cup chicken broth; 1 tablespoon chopped fresh flat-leaf parsley; 2 teaspoons fresh thyme leaves; .5 teaspoon black pepper; .125 teaspoon cayenne pepper; .25 cup sliced scallions