– Peanut butter – Butter – Brown sugar – Self-rising flour (you can also use all-purpose, you'll just need to add leavening – Eggs – Vanilla
First you'll melt the butter, then add the peanut butter and melt. Then just whisk until it's nice and creamy.
Next, whisk in the brown sugar and add eggs and vanilla.
Then whisk in the flour. Bake the cake for about 25 minutes and that's it!