Slow Cooker Chicken Chile Relleno Casserole

Name: Slow Cooker Chicken Chile Relleno Casserole
Ingredients: Cooking spray; 2 (7 ounce) cans whole green chiles, drained, patted dry, and halved lengthwise; 5 ounce sharp Cheddar cheese, shredded, divided; 4 ounce pepper Jack cheese, shredded, divided; 2 cups pulled cooked chicken; 3/4 cup evaporated milk; 8 large eggs; 2 tablespoon cornstarch; 1 teaspoon kosher salt; 1/2 teaspoon garlic powder; 1/2 teaspoon ground black pepper; 1/4 teaspoon smoked paprika; 1/2 cup prepared red enchilada sauce; Chopped fresh cilantro; Sour cream, for serving