Yes, you can typically use 1 egg instead of 2 in brownie recipes, but it may slightly affect the texture and richness of the final product. Eggs play a crucial role in brownie recipes by providing structure, moisture, and richness.
Using only 1 egg instead of 2 may result in brownies that are slightly less tender and moist, as eggs help bind the ingredients together and contribute to a fudgy texture. Additionally, with fewer eggs, the brownies may be slightly less rich and have a slightly different flavor profile.
However, if you choose to use only 1 egg, the brownies will still likely turn out quite well and be perfectly edible. Just keep in mind that the texture and taste might be a little different from the original recipe with 2 eggs. If you have dietary restrictions or other reasons for using fewer eggs, it's a reasonable substitution, but you might want to adjust other wet ingredients or add a bit more fat or liquid to compensate for the missing egg.
To summarize, using 1 egg instead of 2 in brownies is possible, but it may alter the final outcome slightly. Experimenting with the recipe and adjusting other ingredients accordingly can help you achieve the desired texture and taste.