Preheat your oven to 350°F (175°C) and prepare an 8x8-inch baking pan with parchment paper or cooking spray.

In a mixing bowl, whisk together the Greek yogurt, granulated sugar, eggs, and vanilla extract until smooth.

In a separate bowl, sift together cocoa powder, flour, baking powder, and salt. Fold into the wet mixture until just combined.

If desired, fold in chocolate chips gently.

Pour the batter into the prepared pan and bake for 20-25 minutes, checking for doneness at 20 minutes.

Let the brownies cool in the pan for about 10 minutes before transferring to a wire rack.