Add 1 cup of oats to a blender or food processor and blend to a fine powder.
Add powdered oats along with the rest of the oats and the remaining ingredients to a large mixing bowl and stir until well combined.
Portion out oatmeal into ½ cup servings and store in resealable plastic bags or in small jars or containers with lids. Add any mix-ins if desired then seal the bags or containers and store until ready to use.
To prepare, pour the oatmeal into a bowl and pour in ¾ to 1 cup of water or milk and stir. Microwave for 1-2 minutes then stir again before serving.