Peanut Butter Cake is a tender, moist cake loaded with peanut butter flavor. There’s no softened butter and no mixer needed, so you can make this 8x8 cake in no time at all.
0 Preheat oven to 350°F / 177°C.
1 Grease an 8x8 cake pan and line it with parchment paper.
2 In a small saucepan over medium-high heat (or in the microwave), heat butter, water, and peanut butter, stirring continuously, until butter is melted and the mixture is simmering.
3 In a mixing bowl, whisk together flour, sugar, and baking soda.
4 Pour boiling liquids over flour mixture and stir until evenly combined. Set aside and allow it to cool slightly.
5 In a small mixing bowl, beat egg. Add sour cream and vanilla and whisk well.
6 Add egg mixture to peanut butter batter and stir just until combined. Pour into cake pan.
7 Bake until cake is set in the middle and a tester inserted comes out clean, 22 to 24 minutes.
8 Let cake cool completely before removing from pan.
9 Dust with powdered sugar just before serving.
