Melt the butter in the microwave or in a small saucepan over low-medium heat. You don’t want it to bubble, as to not lose any of the liquid in the butter. Pour it into a big mixing bowl and let it cool down to room temperature in the fridge. Takes about 20 minutes.
150 g butter
Once the butter has reached room temperature add the granulated sugar and brown sugar to the mixing bowl and with rubber spatula whisk it together for 1 minute. Alternatively, mix it together in a stand mixer using the paddle attachment.
150 g granulated sugar, 50 g brown sugar
Add the egg, vanilla extract and mix it in until combined.
1 egg, 1 teaspoon vanilla extract
In a separate bowl, stir together flour, baking powder, baking soda, and salt. Add the dry ingredients and mix it together until just combined.
230 g all-purpose flour, ½ teaspoon baking soda, ½ teaspoon baking powder, ½ teaspoon salt
Add the fresh blueberries and gently fold them in. Then add the blueberry jam and with a butterknife swirl it into the cookie dough. It’s important not to over mix the dough.
2 tablespoon blueberry jam, 75 g fresh blueberries
Using a 2 tbsp/ 1.3 ounce cookie scoop, scoop out 14 cookies and place them pre scooped in the fridge. Let them sit in the fridge for 1 hour.
Preheat the oven at 180ºC / 355ºF and prepare a baking sheet with baking paper.
Place 6 cookie dough balls per baking tray and bake them for 12-13 minutes.
Once baked, let them cool down on the baking tray for 5 minutes as they still will be soft when they are done. After they have cooled down a bit, use a spatula to lift them onto a cooling rack.