Quick and fudgy cookies made from boxed brownie mix, perfect for a fast chocolatey treat.
1 box brownie mix (approximately 18–20 ounces)
1/2 cup unsalted butter, melted
2 large eggs
1 teaspoon vanilla extract
1/2 cup chocolate chips or nuts (optional)
Optional mix-ins include chocolate chips, nuts, or caramel. Slightly underbake for maximum chewiness.