Preheat your oven to 300 degrees.
Prep an 8×8 or 9×9 inch aluminum pan with nonstick spray.l, and set aside.
Prep two large mixing bowls. In one, combine your dry ingredients: flour, cocoa powder, baking powder, and salt. In the second bowl, whisk together your eggs, oil, syrup, yogurt, and vanilla until smooth.
Pour your dry ingredients into your wet ingredients a little at a time and mix until incorporated. Don’t overmix.
Pour you batter into your greased pan and spread.
Bake for 15-18 minutes. You want these fudgy so don’t overbake. They won’t look completely ready but they will firm up as they cool.
Let the brownies sit for 8-10 hours or overnight to cool completely and firm up.