Get your oven ready by preheating it to 350°F (175°C). Then, line an 8x8-inch square pan with parchment paper – this makes cleanup a breeze!
In a large bowl, whisk together all your dry ingredients (coconut flour, tapioca starch, sugar-free sweetener, cocoa powder, baking soda, and salt) until they're well combined.
Now, gently fold in the Greek yogurt (or sour cream), melted butter, egg, and vanilla extract. Stir everything until it's just combined and smooth.
Add a few drops of red food coloring, mixing until you get that beautiful red velvet hue. You're in charge of how vibrant it looks!
Carefully fold in most of your sugar-free chocolate chips into the batter.
Pour the batter evenly into your prepared pan. If you like, sprinkle a few extra chocolate chips on top for an extra treat! Bake for about 20 minutes, or until a toothpick inserted into the center comes out mostly clean.
Let these delicious brownies cool completely before slicing into 16 perfect squares. Enjoy your healthy, homemade treat!