How to Frost a Cake

How to frost a layer cake with smooth, even sides using a crumb coat, the technique bakeries actually use. — Photo by Los Muertos Crew on Pexels

The smooth, bakery-style finish on a frosted layer cake comes down to one step home bakers skip: the crumb coat. This is the technique bakeries actually use to keep loose crumbs out of the final layer of frosting.

Steps

1Make sure cake layers are completely cool, frosting a warm cake melts the frosting and tears the crumb.
2Level the tops of the layers with a serrated knife if they domed while baking.
3Place the first layer on a cake board or plate and spread an even layer of frosting on top.
4Stack the second layer on top, pressing gently to level it.
5Apply a thin "crumb coat", a very thin layer of frosting over the entire cake, to seal in loose crumbs.
6Refrigerate for 15-20 minutes until the crumb coat firms up.
7Apply the final, thicker layer of frosting, smoothing with an offset spatula or bench scraper.

Common mistakes

Skipping the crumb coat: this is the single biggest cause of visible crumbs mixed into the final frosting layer.
Frosting a warm or cooling cake: this melts the frosting and drags loose crumbs through it.
Overfilling the piping bag or using frosting that's too soft: warm, soft frosting slides off the sides instead of holding a clean edge.

Equipment

Offset spatula
Bench scraper (optional)
Cake turntable (optional, but makes smoothing much easier)
Serrated knife

FAQ

What is a crumb coat and is it really necessary?

A crumb coat is a thin layer of frosting applied first and chilled before the final coat, it traps loose cake crumbs so they don't end up smeared through the visible final layer. It's optional for a rustic look, but essential for smooth, bakery-style sides.

How do I get perfectly smooth sides on a frosted cake?

After the crumb coat sets, apply a generous final layer and hold a bench scraper at a slight angle against the side while rotating the cake on a turntable, wiping the scraper clean between passes.

Need exact temperatures or timing? Check our Time & Temperature Guide →