Preheat oven to 350℉. Use a silicone muffin tray and lightly grease it with butter or spray with oil.

In a large bowl, whisk together almond flour, sugar, and salt. Add egg whites, lemon zest, vanilla extract, and almond extract. Mix until fully combined, using hands if needed.

Scoop 2 tablespoons of dough into each muffin cavity, pressing gently to form a small bowl. Add 1 teaspoon of strawberry jam in the center. Cover with another 1 tablespoon of dough, pressing gently to seal. Optionally sprinkle with sugar.

Bake for 15 minutes at 350℉, then increase oven temperature to 425℉ and bake for an additional 3 minutes until golden.