Check your coffee mugs to make sure each one holds 1 1/2 cups water.
Place dry cake mix and dry pudding mix into a large bowl and blend well with a whisk. This will be about 4 to 4 1/2 cups of dry mix and will make 8 coffee cup cake mixes. Divide mix into 8 small plastic bags (about 1/2 cup each). Place mix into a corner of each bag and tie it there with a twist tie.
Make glaze mix: in a medium bowl, combine confectioners sugar with powdered flavoring mix. Divide into 8 small plastic bags and close bag with a twist tie. Attach each glaze mix to the cake mix bags with a twist tie. Place one of each bag into each cup.
Attach the following instructions to each cup: Generously spray inside of cup with cooking spray. Empty contents of cake mix packet in cup. Add 1 egg, 1 tablespoon of oil, 1 tablespoon water to dry mix. Mix 15 seconds, carefully mixing in all dry mix. Microwave on full power for 2 minutes. While cake is cooking, place ingredients from Glaze mix into a very small container and add 1 1/2 teaspoon water. Mix well. When cake is done, pour glaze over cake in cup. Enjoy while warm.