Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper to prevent sticking.
In a large bowl, whisk together the almond flour, ground flaxseed, baking powder, salt, and sweetener until evenly combined.
In a separate bowl, beat the egg. Stir in the almond butter, melted coconut oil, and vanilla until smooth.
Pour the wet mixture into the dry ingredients.
Stir with a spatula until a thick dough forms. If the dough looks crumbly, add almond milk 1 tablespoon at a time until it holds together and feels like soft cookie dough.
Fold in the sugar-free chocolate chips, nuts, coconut, and seeds, if using. Mix just until distributed.
Scoop the dough into 8–10 portions (about 2 tablespoons each).
Roll lightly and flatten to about 1/2 inch thick on the baking sheet. These cookies don’t spread much, so shape them how you want them to look.
Bake for 10–13 minutes, until the edges are set and lightly golden. The centers should still be slightly soft.
Cool on the baking sheet for 10 minutes, then transfer to a rack.
They firm up as they cool, so resist moving them too early.
Enjoy warm or at room temperature. For a breakfast boost, pair with coffee or tea and a few berries.