Preheat the oven to 302 F/ 150°C or, even better with a convection fan (140°C / 284F). Using convection is one of the best tips to ensure that the macarons stay soft on the inside and crisp on the outside.
Line a baking sheet with parchment paper. Using an ice cream scoop (or teaspoons) or a piping bag with a round or star-shaped nozzle, pipe about 25 small portions directly on the sheet, pressing a whole hazelnut into the center of each portion. This gives the macarons their distinctive appearance. Tip: Allow the macarons to dry at room temperature for about 1 - 1 1/2 hours to prevent them from spreading too much. In this case, do not preheat the oven yet.
Alternatively, you can evenly distribute the nut mixture onto wafers (German oblaten - like the ones you use for gingerbread). Using a spoon or teaspoon, create small heaps on a baking sheet, placing a whole hazelnut in the center of each heap.