How do I make the icing thicker?
Add more powdered sugar, 1 to 2 tablespoons at a time. Give it a full whisk before deciding, because it takes a moment to fully hydrate.
How do I make it thinner for drizzling?
Whisk in milk or cream 1 teaspoon at a time. This is the difference between “perfect glaze” and “why is it running off the plate.”
Can I use water instead of milk?
Yes, but milk or cream tastes richer and helps the icing feel creamy instead of purely sweet. If you only have water, add a tiny extra pinch of salt and a touch more vanilla.
What gives it that fresh flavor without tasting like lemon icing?
A little citrus zest, especially lemon. You will not taste “lemon icing” if you keep it to a small amount. It just lifts the vanilla and cuts the sweetness.
Why is my icing lumpy?
Usually it is powdered sugar clumps. Sift the sugar if yours is compacted, and whisk the butter and vanilla first so the sugar has a smooth base to dissolve into.
Should I ice cinnamon rolls hot or cooled?
Ice them warm for maximum melt and soak, about 5 minutes out of the oven. Ice them cooled if you want a thicker, more defined layer on top.
Will it set?
It should set slightly and gloss over as it sits. Humidity, the exact milk or cream you use, and how warm your rolls are can all affect how firm it gets. If you want it to set thicker, use less liquid and ice mostly cooled rolls.
Does a hand mixer make it better?
A whisk is perfect for a smooth, pourable glaze. A hand mixer is optional and best if you want it thicker and a bit more fluffy. Just know it can feel less drizzly and more like frosting.