Preheat oven to 325°F (165°C) and line a baking sheet with parchment paper. Spread the cashews evenly on the baking sheet and roast for 11-14 minutes, or until slightly golden. You don't want to roast the cashews too much otherwise your chocolate butter will have a strong cashew flavor. Remove from the oven and let cool a few minutes.

In the meantime, add the coconut sugar and cocoa powder to the bowl of a high-speed blender. Blend for 2-3 minutes, or until the coconut sugar looks like powdered sugar. Transfer the powdered sugar to a bowl and set aside.

Add the roasted cashews to the blender and blend on high-speed until it turns into butter. Add the powdered coconut sugar, melted cocoa butter, vanilla extract, and salt. Blend for another 3-5 minutes, or until very smooth. The longer you blend the smoother.

Transfer to a clean glass jar and keep at room temperature. Use to top oatmeal, waffles, crepes, or bread! The vanilla chocolate butter will keep for up to 1 month.