Preheat the oven to 350℉ and line a baking sheet with parchment paper and set aside
In a microwave safe bowl, melt 1 cup of butter and add to a large mixing bowl to cool for 15 minutes
In a separate bowl, add the following dry ingredients: flour, baking powder, baking soda and salt
In the cooled bowl of butter, add the granulated white sugar, brown sugar, lemon juice and lemon zest and mix. Then, add in the egg and egg yolk and mix. This should be a yellow-tinted color.
Add the dry ingredients to the wet and mix until a dough forms
Fold in the frozen blueberries GENTLY just until incorporated throughout the dough. Once you start seeing blueberries burst and dye your dough, you can stop mixing. Don't overmix or all of the dough will be stained blue
Working quickly, use a cookie scoop to drop 6 cookies onto the baking sheet. Flatten them out slightly with your hand and add a cheesecake disk to the center. Fold the dough gently around the cookie dough being sure to cover the cheesecake on all sides so nothing oozes out while baking
Pop in the oven and bake for 14 -16 minutes. The edges should be golden brown
While the first 6 cookies bake, make the next 6 on another baking sheet and pop in the oven once the first batch is done. Repeat until all the dough has been used.
Wait for cookies to cool and enjoy!