Preheat the oven to 350°F (180°C). Line a 6-inch brownie pan with parchment paper and grease it with cooking oil spray. Set aside. In a large mixing bowl, add yogurt, coconut sugar, almond butter, cocoa powder, vanilla extract, and salt, if used. Stir with a silicone spatula until the batter is sticky and well combined. Fold in chocolate chips if used and stir to incorporate.
Pour the batter into the prepared pan and spread evenly. Sprinkle extra chocolate chips on top if you like. Bake the brownies on the center rack of your oven for 25-30 minutes at 350°F (180°C) until a toothpick inserted in the center comes out clean. Cool in the pan at room temperature for 10 minutes, then on a cooling rack for an hour before slicing.
Note: You must use a granulated sweetener. No maple syrup or the brownies won’t firm up. You can use brown sugar, sugar, and Monk fruit blend for a sugar-free option.