Preheat and prep: Heat oven to 350°F (175°C). Line a baking sheet with parchment paper for easy cleanup and even browning.
Cream the butter and sweetener: In a large bowl, beat softened butter with the brown-style sweetener until fluffy, about 1–2 minutes.
If you like a sweeter cookie, add 1–2 tablespoons of granular sweetener here.
Add egg and vanilla: Mix in the egg and vanilla extract until smooth. Scrape the bowl so everything combines evenly.
Combine dry ingredients: In a separate bowl, whisk almond flour, coconut flour, baking powder, sea salt, and xanthan gum. This removes clumps and helps with texture.
Make the dough: Add dry ingredients to the wet mixture and stir until a thick dough forms.
It will look a bit soft—this is normal.
Fold in the mix-ins: Gently stir in keto white chocolate chips and chopped macadamias. Aim for even distribution so every cookie gets a little of everything.
Chill briefly: Refrigerate the dough for 15–20 minutes. This firms it up, reduces spread, and enhances chewiness.
Portion: Scoop about 1.5 tablespoons of dough per cookie (a small cookie scoop works well).
Roll into balls and place 2 inches apart on the lined sheet. Lightly press to flatten to about 1/2 inch thick.
Bake: Bake 9–12 minutes, until edges are just set and lightly golden. The centers may look slightly soft—they’ll firm up as they cool.
Cool completely: Let cookies rest on the sheet for 10 minutes, then transfer to a rack to cool fully.
Cooling helps them set to the perfect chewy texture.