Start with butter – it needs to be properly softened, not melted. I usually leave it out on the counter for about an hour until it’s soft enough that I can easily press my finger into it, but it still holds its shape. If you’re in a hurry, cut it into chunks to speed things up.
Add the softened butter to a mixing bowl and beat it with an electric mixer on medium speed for about 2 minutes. You want it to get really light and fluffy – it’ll actually change color slightly, becoming a paler yellow.
Pour in the honey and vanilla extract. Beat for another minute or so until they’re completely mixed in.
In goes the powdered sugar, cinnamon, and that tiny pinch of salt. The salt might seem odd, but it really brings out the sweetness and makes all the flavors pop. Mix on low speed at first (unless you want a powdered sugar cloud in your kitchen!), then increase to medium and beat for about 2 more minutes.
Keep mixing until everything is completely combined and the color is uniform – you shouldn’t see any streaks of cinnamon.
Give it a quick taste (the best part!) and adjust if needed.
Scoop the butter into an airtight container.