Step by Step
In this extract recipe, the oats are not going to provide any sugars for fermentation so the amount of malt extract is greater than the other recipes. Place the oats loosely in a grain bag. Since the oats will swell, avoid packing them too tightly in the bag. Use more bags if needed. Steep the bag in 2 gallons (~8 L) of 170 °F (77 °C) water for about 30 minutes. Lift the grain bag out of the steeping liquid and rinse with warm water. Allow the bags to drip into the kettle for a few minutes while you add the malt extract. Since this is only oats, squeeze the bags to extract the liquid. Add enough water to the steeping liquor and malt extract to make a pre-boil volume of 5.9 gallons (22 L) and a gravity of 1.043 (10.6 °P). Stir thoroughly to help dissolve the extract and bring to a boil.
Once the wort is boiling, add the bittering hops. The total wort boil time is one hour after adding the bittering hops. Chill the wort rapidly to 68 °F (20 °C), pitch the yeast and aerate thoroughly. Follow the fermentation and packaging instructions for the all-grain version.
Begin fermentation at 68 °F (20 °C) slowly raising temperature to 72 °F (22 °C) by the last one-third of fermentation.
Instructions provided from: https://byo.com/stories/item/1647-witbier-style-profile