Preheat oven and broiler to 450°. In a mixing bowl, combine the butter and bread crumbs, using a spatula to mix, until a paste forms. Add the Gruyère and Parmesan, and combine. Stir in the thyme ...
For the batter, whisk the flour, salt, paprika, and cayenne pepper in a medium-size mixing bowl. Whisk the milk, eggs, and melted butter in a small mixing bowl. Pour the milk and egg mixture over ...