To easily roast coffee beans at home, all you need is a simple air popper, like those commonly used for making popcorn. They work by circulating hot air.

The heating element and fan create a fast-moving vortex of hot air to pop kernels, and it also works to evenly and perfectly roast coffee beans.

Measure the beans with the provided cup, pour them into the popper, and stir occasionally to ensure even roasting. The beans will start to chaff and exit through the chute.

The beans will crack after two minutes, when they hit 400 degrees F, and again after four minutes, when they hit 450 degrees F. Once cracked, pour the beans into a colander.

How long you let your beans roast depends on your preference for light, medium, or dark roast. The beans are darkly roasted when they go silent after the second crack.