Preheat your oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper.
In a bowl, mix almond flour, cocoa powder, baking powder, and sweetener until well combined.
In another bowl, whisk eggs, melted butter, vanilla extract, and melted unsweetened chocolate.
Slowly add the dry ingredients to the wet ingredients, mixing until a smooth batter forms.
Pour the batter into the prepared baking dish and spread evenly.
Bake for 20 minutes, then remove from the oven and set aside.
While brownies are baking, prepare the pecan pie topping. In a saucepan, melt butter over medium heat.
Add sugar-free maple syrup, heavy cream, and chopped pecans. Stir and cook for 2-3 minutes until slightly thickened.
Pour the pecan mixture over the partially baked brownies, spreading evenly.
Return to the oven and bake for another 15 minutes.
Let the brownies cool completely before slicing. Enjoy!