Peanuts can be roasted on stovetop or in microwave oven or conventional oven.
For stovetop method, take a heavy bottom pan and heat on medium flame. Add the peanuts and keep stirring until you see dark brown spots. This takes around 15-20 minutes.
Roasting in conventional oven requires preheating the oven to 350 deg F and roasting for 15-20 minutes.
Roasting in microwave oven is quick and easy. The steps include:
1. Place peanuts in a microwave safe dish and spread evening.
2. Microwave on high power for 1 minute.
3. Stir well and microwave for 30 seconds.
4. Continue doing step 3 until the skin turns brown. Make sure to stir every 30 seconds otherwise there is a fair chance of burning the peanuts. It takes around 3 minutes in total.
I prefer microwave method over stovetop and conventional oven.