Easy Peanut Butter Cake

Step 1: 

Heat butter, water, and peanut butter together 

Step 2: 

Whisk together dry ingredients (flour,  sugar, and  baking soda). 

Step 3: 

Combine warm ingredients and dry ingredients. Set aside.

Step 4: 

Whisk together egg,  sour cream,  and vanilla.

Step 5: 

Combine everything  in one bowl and pour into prepared 8x8 pan

Step 6: 

Bake until just set, 20 to 24 minutes.