Preheat a convection oven to 325 degrees Fahrenheit (163 degrees Celsius) and line a heavy-gauge baking sheet with a silicone mat or parchment paper.
In a medium bowl, sift and whisk together the almond flour, baking powder, and sea salt to eliminate clumps and ensure even leavening.
In a separate stand mixer bowl, cream the softened butter and granulated sweetener on medium speed for 2 minutes until aerated and pale.
Incorporate the egg and vanilla extract into the butter mixture, beating until emulsified.
Lower the mixer speed and gradually integrate the dry ingredients until a cohesive, non-sticky dough forms.
Using a calibrated scoop, portion the dough into 18 spheres (approximately 25 grams each) and arrange them 2 inches apart on the baking sheet.
Depress the center of each sphere using a damp thumb or the back of a 1/2 teaspoon measure to create a uniform cavity without cracking the edges.
Distribute 1/2 teaspoon of sugar-free preserves into each cavity using a small spatula.
Transfer the sheet to the center rack and bake for 12 to 15 minutes, or until the peripheral edges achieve a light golden hue.
Execute a full cooling cycle on the baking sheet for a minimum of 20 minutes; the cookies require thermal reduction to set their internal structure and avoid disintegration.