Preheat your oven to 350°F (175°C). This step ensures that your brownies bake evenly once the batter is ready.
Line a 9x9 inch baking pan with parchment paper, leaving some overhang on the sides. This makes it easier to lift the brownies out of the pan once they’re baked.
In a mixing bowl, melt the 4 tablespoons of unsalted butter in the microwave or on the stovetop. Allow it to cool slightly.
To the melted butter, add 4 tablespoons of avocado oil, 1 cup of sugar, 1/4 cup of Greek yogurt, and 1 teaspoon of vanilla. Mix well until smooth and creamy.
In a separate bowl, whisk together 3/4 cup of flour, 1/2 cup of cocoa powder, 1 tablespoon of cornstarch, 1/2 teaspoon of baking soda, and 1/4 teaspoon of salt.
Gradually add the dry mixture to the wet ingredients, stirring gently until just combined. Be careful not to overmix.
Pour in 2 tablespoons of hot water and mix until everything is well incorporated. This step helps to enhance the chocolate flavor.
Gently fold in 1/4 cup of mini semi-sweet chocolate chips into the batter, ensuring they are evenly distributed.
Pour the brownie batter into the prepared baking pan, spreading it evenly. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Once baked, remove the brownies from the oven and let them cool in the pan for about 10 minutes. Then, lift them out using the parchment paper and let them cool completely on a wire rack. Slice into squares and enjoy!