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Preheat oven to 350°F. Line an 8-inch-square baking pan with nonstick foil, allowing it to overhang ends of pan.
In a medium bowl, combine cocoa powder, flour, baking powder and salt. Set aside.
In a large bowl, whisk together oil, granulated sugar, brown sugar, egg whites and vanilla. Stir in cocoa mixture. Spoon batter evenly into prepared pan. Sprinkle walnuts over batter. Bake for 25 minutes. Scatter the chocolate chips and marshmallows over the top and bake for an additional 5 minutes. Remove from the oven and cool completely.
To slice, coat a sharp chef's knife with cooking spray and cut into 25 squares, using a rocking motion. Re-coat knife frequently.