Heat the oven to 350°F. Spray a 9X9-inch or 8X8-inch pan with baking nonstick spray for thicker brownies. Place parchment paper on the pan's bottom and sides. Repeat spraying.
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Mix flour, cocoa powder, cornstarch, and salt in a medium basin. Set aside.Beat sugar, eggs, and egg yolk on high for 5 minutes in a mixer with a whisk attachment. A faint color will result.
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Melt the butter and add the oil, sugar, and red food dye. Mix slowly until everything is just mixed. Add the dry ingredients and mix them in until they are just mixed in.
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Add the white chocolate chips after taking the machine off. To fold them in, use a plastic spatula. Put the mix in the pan.
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Bake 45-50 minutes. Bake until a toothpick reveals moist crumbs. Continue baking for 5 minutes if raw.Cut the brownies when they've cooled fully on a cooling rack.
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