Preheat and prep: Heat the oven to 350°F (175°C). Line a baking sheet with parchment paper for easy release and cleanup.
Mash or measure: If using banana, mash 1 medium very ripe banana until smooth (about 1/3 cup). If using applesauce, measure 1/3 cup unsweetened applesauce.
Mix the wet ingredients: In a medium bowl, whisk 1 egg, 1/3 cup mashed banana or applesauce, 2 tablespoons almond butter, and 1 teaspoon vanilla until smooth.
Combine dry ingredients: In another bowl, whisk 1 3/4 cups superfine almond flour, 1 teaspoon baking powder, 1/2 teaspoon cinnamon, and 1/4 teaspoon salt.
Bring it together: Add the dry mix to the wet ingredients.
Stir with a spatula until a soft, slightly sticky dough forms. If using add-ins, fold in up to 1/3 cup.
Chill briefly (optional but helpful): If the dough feels too sticky, chill it for 10–15 minutes. This makes scooping and shaping easier.
Portion and shape: Scoop heaping tablespoonfuls (about 1 1/2 tablespoons each), roll into balls, and place 2 inches apart on the baking sheet.
Gently flatten to about 1/2-inch thick. For a classic look, press a few sliced almonds on top.
Bake: Bake 12–15 minutes, until the edges are golden and the centers look set. Almond flour browns quickly, so check at 11 minutes.
Cool: Let cookies cool on the sheet for 5 minutes, then transfer to a rack.
They firm up as they cool.
Taste and adjust sweetness next time: If you want a sweeter cookie without sugar, use a riper banana next time or add a touch more vanilla and cinnamon to boost perceived sweetness.