Start by washing and finely chopping the broccoli into very small pieces. Smaller pieces help the brownies cook evenly and improve texture. Avoid large chunks as they can make the brownies crumbly.
In a large bowl, whisk together the eggs, olive oil, and milk until smooth. This step ensures a well-combined base that will hold the batter together perfectly during baking.
Now add flour, baking powder, salt, pepper, and garlic powder into the wet mixture. Stir gently until everything is combined without overmixing, which keeps the brownies soft.
Add the chopped broccoli and crumbled feta cheese to the batter. Fold everything together gently so the ingredients are evenly distributed throughout the mixture.
Line or grease your baking pan and pour the batter into it. Spread it evenly using a spatula so it bakes uniformly and has a nice even thickness.
Place the pan in a preheated oven at 180°C (350°F) and bake for 25–30 minutes. The top should turn slightly golden, and a toothpick inserted should come out clean.
Allow the brownies to cool in the pan for a few minutes before slicing. This helps them firm up and makes cutting easier without breaking apart