An impressive hack will ensure that frozen fries will be crispy – but you must do one thing before putting them in the oven.

Although they are simple to prepare at home, their wide availability in grocery stores leads many people to purchase frozen ones and stash them away for a rainy day. While frozen French fries are a convenient food, they require a fairly significant amount of time to cook. A food expert has shared an easy hack that can result in “crispiest” frozen French fries in no time.

When prepared in the oven, they can take nearly 30 minutes.

Writing for Simpy Recipes, Adriana Chavez explained that using this one technique can cut down the cooking time from 30 minutes to 10 minutes.

According to the expert, putting the frozen French fries in the microwave before cooking them in the oven will “make the fastest, crispiest, frozen fries.”

She said: “Use the microwave to make quick and crispy frozen fries.”