Gather and measure all the ingredients for your TikTok blueberry cookies.
Preheat the oven to 350°F and line a baking sheet with parchment paper.
Heat the frozen blueberries over medium-high heat until they become soft and mushy. Remove from the heat, then let them cool completely.
Using a stand mixer, beat the butter and sugars until smooth and creamy.
Add the cooled blueberries and mix on high speed.
Add the flour and baking powder to the wet ingredients. Mix just until combined. Do not overmix.
Fold in the chopped white chocolate. Next, cover the dough with plastic wrap and chill in the fridge until firm.
Scoop the dough using a cookie scoop and arrange the portions on the prepared baking sheet.
Bake for 10 minutes, or until the edges are lightly golden and set.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring to a cooling rack. Cool completely and enjoy!