Should you beat eggs before adding to brownie mix?

Chef's answer
Turns out that the difference between a brownie that's simply fine and one that's superlative is all about how you treat the eggs and sugar: They need a good, long, separate whipping to add heft to the batter. ...
Frequently asked Questions 🎓
You can use mayonnaise as an egg substitute in a brownie mix. I have tried a heaping tablespoon and a little extra water. Mayonnaise contains both oil and eggs, so this is not much of a stretch. ... Mayo is combination of egg and oil, so it is what the cake need..
Turns out that the difference between a brownie that's simply fine and one that's superlative is all about how you treat the eggs and sugar: They need a good, long, separate whipping to add heft to the batter. ...
Yogurt and buttermilk are dairy-based substitutes for oil in brownie recipes. Using plain yogurt is a better choice for baking than flavored yogurt. If you're making a recipe that requires 1/2 cup of oil, you should use a 1/4 cup of plain yogurt or buttermilk.
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