Preheat oven at 325
Place a baking sheet on middle rack and remove top rack from oven. Before starting batter, wash jars, lids, and rings in hot soapy water and let drain, dry, and cool to room temperature.
Generously prepare inside of jars with margarine.
To prepare batter, combine flour, sugar, baking soda,and cinnamon in a mixing bowl.
In another mixing bowl, combine margarine, water, cocoa powder, buttermilk, egg white, and vanilla.
Stir dry mixture into liquid untill well blended.
Divide batter among 3 jars (should be slightly less than half full). Carefully wipe rims clean, then place jars on baking sheet (or they will tip over) in the center of the oven.
Bake 40 minutes.
Keep lids in hot water until they are used.
When cakes are done, remove jars which are HOT from oven one at a time. If rims need cleaning, use moistened paper towel. Carefully put lids and rings in place then screw tops on tightly shut.
Place jars on a wire rack: they will seal as they cool. Once jars are cooled, decorate lids with round pieces of cloth, ribbons, etc.
The brownies in a jar will last 5 months if unopened. Store in refrigerator after opening.

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Thanks to Inky Dinky Doo