This easy peanut butter cake is just four ingredients and an easy one bowl recipe. The cake doesn't require flour, butter, milk or oil but you won't be able to tell!
Preheat oven to 350°F (177°C). Grease the interior of a 6 inch round cake pan.
Add peanut butter, egg, sugar and baking powder to a large mixing bowl. Whisk until batter is smooth and uniform in color and no egg streaks remain.
Pour batter into prepared baking pan. Bake for about 25-30 minutes or until toothpick inserted comes out clean. Let cake cool fully in pan before cutting and serving. The middle of the cake may have a bump higher than the rest of the cake. If that happens, you can level your cake with a knife before decorating or just leave it for a more rustic appearance. Cake can be decorated with powdered sugar before serving or other frosting of your choice.
Notes
This cake has a slightly denser crumb, so it is more like a snack cake or breakfast cake. I wouldn't use it for a layered cake but it's great as a single layer cake served with tea or coffee or fresh fruit.
The cake is lightly sweetened. If you prefer very sweet desserts, you can always add a sweet frosting on top.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.