Bake this irresistible Cake Mix Peanut Butter Bars at home. Made with peanut butter, water, egg and yellow cake. Easy step-by-step instructions included.
This Cake Mix Peanut Butter Bars relies on simple, everyday ingredients such as peanut butter, water, large egg and yellow cake mix. It comes together quickly and makes 4 servings, at about 779 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 Cake Mix Peanut Butter Bars 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