Wash and thoroughly dry the mason jars and lids.
In a large bowl, mix the flour, baking soda, cinnamon, nutmeg and salt. Use a whisk to thoroughly mix the ingredients.
Using a funnel, divide the flour mix equally amongst the 12 jars. If you do the math, technically, it should come to about 1 cup and a scant 1TB in each jar. It doesn't. Because of the whisking, the ingredients expand a bit. Typically, I end up putting 1 cup and 2-3TB of the flour mix in each jar.
Using the funnel, add 1 cup of coconut sugar to each jar.
Using the funnel, add 1 cup of oatmeal to each jar.
Using the funnel, add 1 scant cup of goodies to each jar.
Put the lids on the jars and seal.