Prevent Your Oatmeal From Overflowing In The Microwave With A Simple Trick - Tasting Table
Briefly

Oats contain starches that swell when heated, forming a gel-like network that traps air bubbles and causes microwave bubbling and spills. Soaking oats in their cooking liquid allows the grains to absorb moisture, preventing gel formation during heating and avoiding boil-overs. Soaking also shortens cooking time, improves digestibility, and produces a creamier texture. For warm microwaved oats, stir oats with water or milk at about a 1:2 oat-to-liquid ratio and refrigerate for at least six hours. In the morning heat on low power for roughly one minute, stirring occasionally, then let stand and add desired toppings.
Not only is it good for you, as nutritionists have been shouting from the rafters for decades, but it's also extremely versatile. Plus, it's straightforward to make, especially if you utilize the microwave. The issue is that when you make oatmeal in the microwave, it can spill over and cause a mess, which is the last thing you want to deal with first thing in the morning. Luckily, a simple trick to prevent this is soaking the oats before cooking.
The reason oatmeal boils over so easily is that there are starches inside oats that swell when heated. As they thicken, they stick together, forming a gel-like structure. At the same time, air bubbles form in the boiling liquid, and they can't rise if they get blocked by that gel. All of that pressure keeps building until it can escape, and there might not be enough room for it to do so if the bowl you're using is too small.
But if you soak the oats in their cooking liquid before heating, they'll absorb it, and you'll avoid all of that. This was actually how it used to be done back in the day - people would prepare oatmeal the night before so that their breakfast would cook faster and be easier to digest. It's still true today, and soaking can also lead to a creamier texture. Plus, it eliminates the need for boiling, thus keeping your microwave clean as a whistle.
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