Cook the Blueberries: In a small saucepan, cook the blueberries over medium heat until they begin to soften and release their juices, about 5-7 minutes. Use a spoon or potato masher to lightly mash the blueberries as they cook, creating a jam-like texture.

Strain the Blueberries: Once the blueberries are soft, remove the saucepan from the heat. Strain the blueberry mixture through a fine mesh sieve to remove the skins and seeds, leaving behind just the blueberry juice and pulp. Allow the blueberry puree to cool.

Mix the Butter: In a separate mixing bowl, beat the softened butter with a hand mixer or stand mixer until smooth and creamy.

Add the Blueberries: Once the blueberry puree has cooled, add it to the butter along with the powdered sugar (or honey), lemon juice, and vanilla extract. Beat until fully combined and smooth.

Chill and Serve: Transfer the blueberry butter to a container and refrigerate for at least an hour to allow the flavors to meld. Serve chilled or at room temperature with your favorite baked goods.