Heat oven to 350 degrees Fahrenheit if you’re using a 13” x 9” pan for 22-25 minutes. Or 325 degrees Fahrenheit for an 8” x 8” pan for 50 to 52 minutes. Or 350 degrees Fahrenheit for an 9” x 9” pan for 36 to 38 minutes.
Stir brownie mix, water, oil and eggs in a medium bowl until well blended. Spread in pan.
Bake as directed above or until toothpick inserted 2 inches from side of pan comes out almost clean; cool.