Peanut Butter Cake

1 . Stage

Preheat the oven to 350 degrees F (175 degrees C). Grease a rimmed baking sheet.

2 . Stage

Make cake: Whisk together flour, sugar, and baking soda in a large bowl. Beat milk, eggs, and vanilla into flour mixture with an electric mixer on low speed until smooth.

3 . Stage

Place water, butter, oil, and peanut butter into a saucepan; cook and stir over medium heat until smooth, about 5 minutes. Stir peanut butter mixture into flour mixture until batter is well mixed; pour and spread onto the prepared baking sheet.

4 . Stage

Bake in the preheated oven until a toothpick inserted into the center of the cake comes out clean, about 20 minutes.

5 . Stage

Make icing: Melt butter and peanut butter in a saucepan over medium heat; stir until smooth. Mix in milk and vanilla until combined. Whisk in confectioners' sugar until icing is smooth, 3 to 5 minutes.

6 . Stage

Pour icing over warm cake.