Whisk eggs and milk in a shallow dish. Whisk almond flour (or meal), Parmesan, paprika, baking powder, salt, pepper and cayenne (if using) in another shallow dish. Dip a few pieces of broccoli at a time in the egg mixture, allowing excess to drip off, then dredge in the flour mixture, tapping off any excess. Transfer the broccoli to the prepared baking sheet. Generously coat with cooking spray.