Heat the oven to 325°F. Prepare an 8x8 baking pan with nonstick spray. Line the pan's edges and bottom with parchment. Spray again.Mix flour, cocoa powder, cornstarch, and salt in a medium basin. Set aside.
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Use a whisk-attached mixer. High-speed beat sugar and eggs for 5 minutes. Light and faint colours will result. Melt butter while combining.
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Mix melted butter, oil, and vanilla on low until mixed. Mix dry ingredients on low until combined.Remove the mix and mix with a rubber spatula. Set aside ¼ cup of brownie batter. In pan, spread brownie batter.
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Beat cream cheese, sugar, and vanilla extract on high for 1 minute in a medium bowl using a hand mixer. Mix with orange food coloring till desired hue. Add the egg and mix slowly.
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Spread cheesecake batter over brownie batter. Make hot water on the stove. Add water to leftover brownie batter and mix.
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Spread brownie batter over cheesecake batter and swirl with a butter knife. Swirl gently.
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Bake 40-50 minutes. Check the center with a toothpick; bake for 5 minutes if much batter comes out.Complete rack cooling. Refrigerate overnight or 2-3 hours wrapped with foil. Cut brownies square.
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