Combine flour, cocoa, salt and baking powder in a medium bowl and stir until well-mixed.
Whisk together sugar and oil in a large bowl. Add eggs and vanilla; whisk until blended. Add dry ingredients; whisk just until blended. Fold in chocolate chips.
Pour batter into a lightly greased or a foil or parchment paper-lined 9-inch (23 cm) square baking pan; spread evenly.
Bake in a preheated 350°F (180°C) oven until toothpick inserted near centre comes out clean, 25 to 30 minutes. Take care not to overbake brownies.
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