Cook the blueberries in a small saucepan over medium heat until they soften.
Mash the blueberries and let them cool completely.
In a bowl, combine softened butter, mashed blueberries, honey, vanilla extract, cinnamon, and salt.
Mix until smooth and evenly blended.
Transfer the butter to an airtight container or roll it into a log using parchment paper.
Refrigerate for at least 1 hour before serving.
Spread on toast, pancakes, waffles, muffins, or biscuits.