Pre-heat the oven to ~450F.
Line a baking sheet with aluminum foil and place a vegetable (now coffee bean) steamer in the center.
Spread out green coffee beans on the central part of a steamer. Aim for full coverage with no beans overlapping (~1/2 cups of beans). The orientation of the beans makes no difference.
Place beans in the oven and set the timer for 3 minutes.
After 3 minutes open the oven and stir the coffee beans using the wooden spoon.
Stir the beans at 3min, 5min, 7min, 9min.
Between 7 and 9 minutes, you should hear some of the beans start to crack/pop. Once the cracking has slowed down (usually goes on for 30 to 60 seconds) remove the beans and pour them into the colander or metal bowl.
Walk outside or to your apartment balcony and pass the beans back and forth between the bowls in order to cool down the beans and remove the outer casing/chaff.
Once cooled to close to room temperature, place the coffee beans in a container with the lid cracked open (mason jars work great!) so that the CO2 can release.
If you can, wait at least one day prior to grinding and enjoying!