Ingredients
Equipment
Method
Prep and form the dough
- Preheat the oven to 350°F (175°C). Set out a baking sheet so it’s ready for the cookies.
- Line a baking sheet with parchment paper. This helps the thumbprint cookies release cleanly after baking.
- In a large bowl, combine the white cake mix, eggs, melted unsalted butter, and vanilla extract. Mix until a soft dough forms.
- Scoop tablespoon-sized portions and roll into balls. Arrange them spaced apart on the prepared baking sheet.
- Press your thumb gently into the center of each cookie. Create a shallow well for the jam so it bakes into the thumbprint.
Fill and bake
- Fill half the cookies with red strawberry jam. Spoon just enough to stay within the thumbprint wells.
- Fill the remaining cookies with blue raspberry jam. Keep the jam mounded slightly so it sets as the cookies bake.
- Bake for 10–12 minutes until lightly golden around the edges. Watch for set centers while the cookies stay tender.
Cool and finish
- Allow the cookies to cool on the baking sheet for 5 minutes. This firms them up before moving so the jam doesn’t tear.
- Transfer cookies to a wire rack to cool completely. Cool fully for the best jam texture and clean slices.
- Dust lightly with powdered sugar if desired. Serve once the cookies are fully cooled.
Notes
For a neater jam center, refill thumbprints right after pressing—if the dough springs back, re-press lightly. Store airtight at room temperature for 3–4 days. Freeze baked cookies up to 2 months (thaw overnight in the fridge, then bring to room temperature). If you need a dairy-free swap, use a dairy-free unsalted butter substitute for similar melting behavior.