Ingredients

Scale

(Makes 24 cookies)

Cookie base:

1 cup (2 sticks / 225g) unsalted butter, softened
½ cup granulated sugar
1 large egg yolk
1 tsp vanilla extract
Zest of 2 lemons (about 2 tbsp—don’t skip!)
1 tbsp fresh lemon juice
2¼ cups (280g) all-purpose flour
¼ tsp salt

Filling:

½ cup seedless jam (lemon curd, raspberry, blueberry, or cherry—you love these!)
Optional: Powdered sugar for dusting

Instructions

1. Make the dough:

Beat softened butter and sugar until light and fluffy (~2 min).
Mix in egg yolk, vanilla, lemon zest, and lemon juice until smooth.
Gradually add flour and salt; mix until just combined (dough will be soft but not sticky).

2. Shape & fill:

Preheat oven to 350°F (175°C). Line baking sheets with parchment.
Roll dough into 1″ balls (use a cookie scoop for uniformity). Place 2″ apart on sheets.
Create thumbprints: Gently press your thumb (or the back of a ½ tsp measuring spoon) into each ball to form a ½” deep well.
Fill: Spoon ½ tsp jam into each well (don’t overfill—jam expands!).

3. Bake:

Bake 12–14 minutes until edges are just golden (centers should look pale).
Cool on pan 5 minutes, then transfer to wire rack. Dust with powdered sugar if desired.

💡 Pro Tips for Perfection:
✅ Zest first, then juice—zesting whole lemons is easier!
✅ Don’t overbake—14 minutes max for tender centers (they firm as they cool).
✅ Jam choice matters:
→ Lemon curd (you love lemon combos!) = extra citrusy
→ Raspberry (you love chocolate-raspberry!) = sweet-tart contrast
→ Blueberry (you love blueberries!) = floral notes
→ Cherry (you love cherries!) = nostalgic depth
✅ Blood sugar friendly (you love this!):
→ Replace sugar with ½ cup monk fruit blend
→ Use sugar-free jam (or make chia jam: ½ cup berries + 1 tbsp chia seeds + 1 tsp lemon juice, simmered 10 min)
→ Net carbs: ~4g/cookie
✅ Keto version:
→ 1¾ cups almond flour + ¼ cup coconut flour
→ ½ cup monk fruit blend
→ 1 egg yolk + 2 tbsp melted butter
→ Sugar-free jam filling
→ Net carbs: ~2g/cookie
✅ Storage: Keep in airtight container 5 days (jam may soften cookies slightly over time). Freeze dough balls; bake from frozen (+1–2 min).

Prep Time & Nutrition (per cookie):