Leave butter at room temperature for 30–45 minutes until fully softened — it should give easily when pressed. Do not melt. Speed up by cutting into small pieces.
Beat softened butter with a hand mixer on medium-high for 2–3 minutes until pale, light, and noticeably fluffy.
Add sifted powdered sugar, honey, cinnamon, and a pinch of salt. Beat on medium for 1 minute until smooth and fully combined. Scrape down the sides and beat 30 seconds more.
Taste the butter. Add a pinch more salt if too sweet, more honey if cinnamon is too strong, or a touch more cinnamon if it’s too mild. The butter should taste sweet and lightly spiced with butter as the main note.
Transfer to a serving bowl and smooth or swirl the top. Serve at room temperature alongside warm rolls or bread. If making ahead, refrigerate in an airtight container and bring to room temperature 20–30 minutes before serving.