Preheat your oven to 350°F and line a 9×9-inch square pan with parchment paper.
To a large mixing bowl, add the olive oil and sugar and use a hand-mixer on high to cream together until well-combined and aerated (3-5 minutes).
½ cup extra-virgin olive oil, 1 ¼ cup granulated sugar
Add the egg and vanilla extract and use the hand-mixer on low to integrate.
1 teaspoon vanilla extract, 2 large eggs
Next, add the flour, cocoa powder, baking powder, and salt and mix again on high to combine, using a spatula to scrape down the sides of the bowl if necessary. You'll be left with a thick and sticky batter.
1 cup all-purpose flour, ⅔ cup unsweetened cocoa powder, 1 teaspoon baking powder, ½ teaspoon salt
With the help of your rubber spatula, add the batter to the prepped baking dish, pushing the batter to the sides until it is distributed equally throughout the pan.
Bake at 350°F for 25-30 minutes until the brownies are set when you wobble the pan. Allow them to cool before cutting. Enjoy!