Prepare coffee and set aside. You can use chilled coffee if desired.
Add rolled oats to a food processor and pulse until it becomes oat flour, 25-30 seconds.
Add 1 cup of the oat flour to a blender with 2 cups of water. Set any remaining oat flour to the side and save for other uses. Blend flour and water for 10-15 seconds.
Strain the oatmeal using a fine mesh strainer. Discard or save the meal for pancakes.
Add oat milk back to the blender with coffee, cocoa powder, dates, and vanilla extract. Blend on high for 5-10 seconds then low for additional 5-10 seconds so you know the dates have been pureed into the mixture. Blend until everything is combined.
Add ice to a glass and pour mixture over ice cubes. You can enjoy this hot by taking prepared oat milk mocha and heating in a pot over medium heat. Enjoy!