Blend the oats until they turn into a smooth flour (see notes).
Add 2.5 cups of water to a pot and bring it to a boil over high heat.
Reduce the heat to a medium-low. Add a little of the oat flour and stir right away.
Keep adding flour and stirring. The mixture will thicken as the oats cook.
Continue stirring, using your wooden spoon to break any lumps. Stir until you have a smooth, homogenous fufu with no lumps.
For softer oat fufu, add a small amount of water (about ⅓ cup) after it has cooked. Cover the pot and let it steam for 3-5 minutes, checking and stirring from time to time, until smooth.
Once cooked remove from the heat, portion as desired and serve with your favorite soups and stews.