1. Preheat your oven to 350°F and line a 10×15-inch rimmed baking sheet with parchment paper.
2. In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt until combined.
3. In another bowl, beat the eggs and sugar with an electric mixer until light and fluffy, around 3-5 minutes.
4. Add the vegetable oil and vanilla extract to the egg mixture, and beat until well combined.
5. Gently fold the dry ingredients into the egg mixture, being careful not to overmix.
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