I ruined a glass cooktop once. Not proud of it. The pot boiled over while I was scrolling my phone, and by the time I smelled the burnt starch, the water had seeped under the burner ring and cracked the surface. Four hundred dollars later, I started taking boil-overs seriously.

The fix is stupidly simple. You just need a wooden spoon laid across the top of the pot. That is it. No special gadgets. No watching the stove like a hawk.

Why This Works

Boiling water bubbles are mostly steam trying to escape. When the bubbles hit the surface, they pop. But when you are cooking something starchy — pasta, potatoes, rice — the starch molecules thicken the water surface. Bubbles pile up instead of popping, and they climb right over the edge.

A wooden spoon breaks the surface tension. When the foam hits the spoon, the bubbles destabilize and collapse. It does not stop boiling — it just stops the climb.

Other Things That Work (and One That Does Not)

Adding a splash of oil to the water helps. The oil floats on top and pops bubbles as they rise. A teaspoon is plenty. Too much and your pasta gets greasy.

Using a bigger pot is obvious but effective. You want the water to fill less than half the pot. More headroom means the foam has to climb farther before it spills.

What does not work: turning the heat down too much. You still need a rolling boil for pasta and potatoes to cook right. The spoon trick lets you keep the heat high.

One Thing I Learned the Hard Way

Do not use a metal spoon for this. It conducts heat, and the handle gets hot enough to burn your hand when you grab it to stir. Wood stays cool. I have a dedicated “boil spoon” now — it lives next to the stove and never goes in the dishwasher.