These brownies contain just under 4 grams of fat apiece.
Position a rack in the center of the oven. Preheat the oven to 350┬░F. Line an 8 x 8-inch baking pan with greased or nonstick spray-coated aluminum foil, allowing it to overhang 2 opposing ends of the pan by about 2 inches.
Melt, stirring constantly, in a large, heavy saucepan over very low heat:
4 ounces semisweet chocolate or bittersweet chocolate, coarsely chopped
2 teaspoons corn oil or canola oil
Remove from the heat and stir in until well combined:
1/2 cup packed light brown sugar
1/4 cup sugar
2 tablespoons light corn syrup
1 tablespoon water
2 teaspoons vanilla
Add and stir until the sugar is dissolved:
2 large egg whites
Stir the flour mixture into the chocolate mixture until well blended and smooth.
Scrape the batter into the pan and spread to the edges. Bake until the center of the top is almost firm when lightly pressed and a toothpick inserted in the center comes out clean, but still moist and fudgy at the bottom, 20 to 25 minutes. Remove the pan to a rack and let stand until completely cool.
Using the overhanging foil as handles, lift the brownie to a cutting board. Carefully peel off the foil. Cut into bars.