Preheat your oven to 300°F and line a baking sheet with a silicone mat or parchment paper.

In a small bowl, sift together the flour and baking powder; set aside.

Place the egg whites in a stand mixer and whip on high until they form stiff peaks.

Slowly add in the sugar while continuing to mix until the sugar fully dissolves into the egg whites. To check, take a bit between your fingers; it should be smooth, not gritty. This step usually takes about 1-2 minutes.

Remove the bowl from the stand mixer and gently fold in the flour mixture until fully incorporated. Stir slowly to maintain the integrity of the stiff egg whites.

Transfer the Pacenica Cookie mixture into a piping bag and pipe 1-inch disks onto the lined baking tray.

Bake for 10 minutes, then rotate the baking trays and bake for an additional 10 minutes.

Allow the cookies to cool on the baking tray before transferring them to a serving tray.