Step 1

Microwave the frozen blueberries for 30-60 seconds until they are soft enough to mash, then mash with a fork until all the berries are mashed. Place in the fridge until the texture is less watery and thicker like jam (10-20 minutes)

Step 2

Preheat oven to 350°F and line 2 baking sheets with parchment paper.

Step 3

In the bowl of a standing mixer with the paddle attachment or a handheld mixer, combine butter and sugars, mixing until light and fluffy (1-2 minutes).

Step 4

Add in the blueberries and beat well until combined. Add in the egg and vanilla and mix again.

Step 5

Mix in the dry ingredients (flour, salt, and baking powder) until a dough forms.

Step 6

Use a medium cookie scoop or spoon to make 1.5-2 tbsp sized balls and place them on the baking sheet around 3-4 inches apart.

Step 7

Bake the cookies (one sheet at a time for even baking) for 8-11 minutes. Remove them from the oven when the edges look set. They will look under-baked in the middle! Remove from the oven and leave them on the baking sheet for 5 minutes, then transfer to a cooling rack to cool completely. Enjoy!