Combine the Parmesan, flour and thyme in a bowl and mix well. With a measuring spoon, spoon level tablespoons of the mixture onto the prepared sheet pans, spreading each round into a 2-½ inch disk. Toss the mixture each time and scoop from the bottom of the bowl to be sure you get some flour in each spoonful. Sprinkle each little disk with a pinch of the flaky sea salt and a grind of black pepper.
* I use a grater like this.
** Maldon sea salt is fantastic. It's a little expensive (as salt goes) but it's used as a finishing salt. Not a salt for every day use. It's delicious as a finishing touch to salads, sandwiches, main dishes etc. Take a pinch of it with your fingers and rub your fingers together as you sprinkle it over the food to bring out the wonderful flavor.