Bake this irresistible The Ultimate Bar Cookie at home. Made with brownie mix, vegetable oil, water and egg. Easy step-by-step instructions included.
This The Ultimate Bar Cookie relies on simple, everyday ingredients such as (18 oz.) pkg. brownie mix, vegetable oil, water and egg, lightly beaten. It comes together quickly and makes 4 servings, at about 958 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this The Ultimate Bar Cookie delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.
Updated Jun 30, 2026