Set your oven to 350°F (175°C) and let it warm up while you prepare the batter.
Collect all the goodies: flour, sugar, cocoa powder, baking powder, salt, eggs, vanilla extract, and melted butter.
In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, and salt until well combined.
In another bowl, mix the eggs, melted butter, and vanilla extract until smooth and creamy.
Pour the wet mixture into the dry ingredients and stir until just combined. Don’t overmix; a few lumps are okay!
Grease a 9x13 inch baking pan or line it with parchment paper for easy removal.
Spread the brownie batter evenly in the prepared pan, smoothing the top with a spatula.
Place the pan in the oven and bake for 20-25 minutes. Keep an eye on them; you want a toothpick to come out with a few moist crumbs!
Let the brownies cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely before cutting into squares.
Dig in and savor the delightful taste of your homemade Lunch Lady Brownies!