Cook the sweet potato. Bake, steam, or microwave until tender.
Let it cool slightly, then peel and mash until smooth. Measure 1 cup.
Preheat and prep. Set the oven to 350°F (175°C). Line a baking sheet with parchment paper to prevent sticking.
Mix wet ingredients. In a large bowl, whisk the mashed sweet potato, egg (or flax egg), maple syrup, nut butter, melted coconut oil, and vanilla until smooth and cohesive.
Add dry ingredients. Sprinkle in the oats, flour, cinnamon, baking powder, and salt.
Stir until combined. The dough should be thick and slightly sticky.
Fold in add-ins. Mix in chocolate chips, nuts, or dried fruit. Keep the total add-ins around 3/4 cup so the cookies hold together.
Scoop and shape. Use a heaping tablespoon or cookie scoop to portion the dough onto the baking sheet.
Flatten slightly with damp fingers; they won’t spread much.
Bake. Bake for 12–15 minutes, until the edges are set and the tops feel dry to the touch. They should look matte, not glossy.
Cool. Let cookies rest on the pan for 5 minutes, then transfer to a rack. They firm up as they cool.
Serve. Enjoy warm or at room temperature.
Pair with yogurt, fruit, or coffee for a complete breakfast.