Place 1 cup of uncooked brown rice in a bowl. Cover with water and let sit for a minute. Use a spoon (or your finger) to stir the rice up a bit to release the starch.
You'll see the water turn a milky color. Use a colander to drain the water.
Add two cups of water to a medium-sized saucepan. Add the rinsed rice. Add optional oil if using. Place over medium-high heat. Bring to a boil.
Reduce heat to simmer and place a lid on the pot. Set your timer for 45 minutes.
After the time is up, remove the lid and stir once to make sure there is no more liquid at the bottom of the pan. If so, let it cook another 5 minutes. If not, remove from heat and allow the cooked rice to rest for 15 minutes. After the resting period, fluff with a fork and either serve immediately, or store in airtight container in your fridge.
Notes
You can add 1 to 2 teaspoons of vegetable oil to the pot with the cooking rice to help prevent stickiness.