Cook filling: Simmer strawberries, 50 g erythritol, and lemon juice 8–10 min; stir in chia; cool.
Mix dry: Whisk almond & coconut flours, 30 g powdered erythritol, and salt.
Cut in fats: Add cold butter and cream cheese; cut until coarse crumbs remain.
Bind: Stir in egg mixture and vanilla to form dough; chill 20–30 min.
Roll & cut: Roll to 3–4 mm; cut 16 rectangles.
Assemble: Place filling (≈1 tbsp) on 8 bottoms, egg-wash edges, top, crimp, vent; chill 10–15 min.
Bake: Preheat 190°C/375°F; egg-wash tops; bake 14–16 min until golden. Cool 5–8 min.
Glaze: Whisk powdered erythritol with cream; drizzle and set.