Preheat the Oven: Preheat your oven to 350°F (175°C) and grease an 8×8-inch baking pan or line it with parchment paper.
Mix Dry Ingredients: In a medium bowl, whisk together the almond flour, cocoa powder, erythritol, baking powder, and salt until combined.
Combine Wet Ingredients: In another bowl, mix together the melted butter, eggs, and vanilla extract until smooth.
Combine Mixtures: Pour the wet ingredients into the dry ingredients and mix until just combined. If using, fold in the sugar-free chocolate chips.
Bake: Spread the brownie batter evenly into the prepared pan and bake for 20-25 minutes, or until a toothpick inserted in the center comes out mostly clean.
Cool and Serve: Allow the brownies to cool in the pan for at least 10 minutes before slicing. Enjoy your low carb brownies as is or top them with whipped cream or berries.