Microwave all pieces for 5 seconds, and flatten into circles.
Bake for 4 to 5 minutes. Remove and let cool for 5 minutes.
In a small bowl, mix together Quest Protein Powder®, banana, almond milk, walnuts, banana extract, sweetener, and cinnamon. Stir until a paste is formed.
Place 2
1⁄
2 tablespoons filling in the center of two cookies. Top with remaining cookies, and serve.