Preheat oven to 350°F.
Unwrap Quest Bar® and cut into four equal pieces.
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 Protein, 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.