01 - In a small saucepan over medium heat, melt the butter. Continue cooking, swirling frequently, until butter foams and develops a nutty aroma and golden brown color, about 3–5 minutes. Remove from heat and let cool 10 minutes.
02 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
03 - In a large bowl, whisk together almond flour, coconut flour, baking soda, and salt.
04 - In another bowl, combine the cooled brown butter and sweetener. Whisk in the egg and vanilla until smooth.
05 - Add wet ingredients to dry ingredients and mix until a soft dough forms. Fold in chopped pecans.
06 - Scoop tablespoon-sized portions onto the prepared baking sheet, spacing 2 inches apart. Flatten slightly with your fingers or the back of a spoon.
07 - Bake for 12–15 minutes, or until edges are golden. Cool on the baking sheet for 10 minutes, then transfer to a wire rack to cool completely.