1. Combine the ground flaxseed and water in a small bowl. Stir thoroughly. Let sit for about 5 minutes, until the mixture thickens. This forms a “flax egg.”
2. For the brownie layer:
   • Set a piece of parchment paper in the bottom of your air fryer. 
   • Combine the brownie mix, ½ of the flax / water mixture, 1 T vegetable oil and pinch of baking powder. Stir to combine. 
   • Roll this mixture into 3 balls, and use your palm to flatten them slightly. Each piece should be about 2 inches in diameter. Set each brownie piece onto the parchment paper.
3. For the cookie layer:
   • In a separate bowl, combine the cookie mix, the remaining flax/water mixture, 1 T vegetable oil and pinch of baking powder. Stir to combine. 
   • Roll this mixture into 3 balls, and use your palm to flatten them slightly. Place each cookie directly on top of each brownie.
   • Air fry at 320 degrees for ~8 minutes.

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