Ingredients
Method
Preparation
- Make the streusel topping: Combine all streusel ingredients in a bowl until crumbly and set aside.
- Preheat oven to 350°F and line a baking sheet with parchment paper.
- Cream butter, granulated sugar, and brown sugar until light and creamy.
- Add egg and vanilla extract, mixing until smooth.
- Mix in flour, corn starch, baking powder, baking soda, and salt gently, then fold in blueberries.
- Add dollops of blueberry jam and swirl gently.
- Scoop 8 cookie dough balls onto the baking sheet and top with streusel.
Baking
- Bake for 13-14 minutes and let cool for 15-20 minutes on the baking sheet before handling.
Notes
Serve slightly warm; the streusel should remain tender-crisp atop a yielding interior. Store in an airtight container layered with parchment to protect the streusel. They keep well for 2 days at room temperature and up to 5 days in the fridge. Rewarm briefly in the oven or microwave for a refreshing taste.
