Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, mix together the applesauce, peanut butter, maple syrup, flax mixture, and vanilla extract (if using).
½ cup unsweetened applesauce, ¼ cup peanut butter, 3 tablespoons maple syrup, 1 tablespoon ground flaxseed + 2.5 tablespoons water, 1 teaspoon vanilla extract
Add rolled oats, almond flour, protein powder, cinnamon, baking powder, baking soda, and salt. Stir until well combined.
1 cup rolled oats, ½ cup almond flour, 1 scoop unflavored vegan protein powder, 1 teaspoon ground cinnamon, ½ teaspoon baking powder, ¼ teaspoon baking soda, Pinch of salt
Fold in the chopped apple, walnuts, and seeds (if using).
½ cup finely chopped apple, 2 tablespoons chopped walnuts, 1 tablespoon pumpkin or sunflower seeds
Let the dough rest for 5 minutes to thicken slightly.
Scoop dough onto the baking sheet (makes 10–12 cookies) and flatten each cookie slightly.
Bake for 14–16 minutes, until the edges are lightly golden and the centers are set.
Let cool on the pan for 5 minutes, then transfer to a wire rack to cool completely.