Heat the oven to 400 F. Lightly coat a baking sheet with cooking spray.
In a food processor, combine the pecans, flour, brown sugar and salt; process until an even texture is achieved. Remove pecan mixture from food processor and place in a medium bowl. In a separate medium bowl, whisk the egg whites. Dip each tofu plank into the egg whites, then into the pecan mixture. Place each plank on the baking sheet. Bake the tofu planks for 15 to 20 minutes or until golden brown and crispy.
To prepare the sauce, in a small bowl combine the honey, Dijon mustard and maple syrup. Stir until smooth. Drizzle sauce over baked tofu right before serving.