Preheat your oven to 350°F (175°C). Grease an 8-inch round cake pan or line it with parchment paper for easy removal later.

In a food processor, pulse the shelled pistachios until they’re finely ground but not turned into a paste. You can reserve a few for decoration if you like!

In a mixing bowl, whisk together the eggs and granulated sugar until well blended and slightly frothy.

Stir in the melted butter, vanilla extract, baking powder, and a pinch of salt. Mix in the ground pistachios until you have a smooth batter.

Pour the batter into the prepared pan and smooth out the top. Bake in your preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for about 10 minutes before transferring it to a wire rack. Serve it warm or at room temperature.