Ingredients
Equipment
Method
Prep
- Preheat the oven to 350°F and line a sheet pan with parchment paper.
- Combine the cake mix, melted butter, eggs, and vanilla in a large bowl until a soft dough forms.
Shape and fill
- Scoop the dough into 1-inch balls and place them 2 inches apart on the prepared sheet pan.
- Press your thumb gently into the center of each ball to create a well.
- Fill half of the cookie wells with strawberry jam.
- Fill the remaining wells with blueberry jam.
Bake and cool
- Bake at 350°F for 10–12 minutes, until the edges are just set.
- Cool on the sheet pan for 5 minutes, then transfer to a wire rack to cool completely.
Notes
For neat thumb wells, press straight down without pushing through the bottom, and aim for the same depth on each ball so the jam bakes evenly. Store airtight at room temperature for up to 3 days or refrigerate up to 5 days; freeze baked cookies up to 2 months. For a dietary swap, use egg substitute for baking (follow package directions) to make them egg-free while keeping the same bake time range.