Step 1

Preheat oven to 375 degrees. Lightly grease a 10x15 in jelly roll pan. Set aside.

Step 2

In a medium saucepan, add salted butter and milk. Turn on medium-low heat. Heat until simmering.

Step 3

Mix flour, sugar, salt, and soda in a large mixing bowl.

Step 4

Pour butter and milk over dry ingredients, whisk together until combined.

Step 5

Add sour cream, eggs, and extract to cake batter. Mix until combined.

Step 6

Pour cake batter into lightly greased pan. Bake for 15 minutes.

Step 7

For Icing - Add butter, peanut butter, and milk to a saucepan and heat over medium-low heat until simmering, mixing frequently.

Step 8

Once simmering, remove from heat. Whisk powdered sugar and extract into peanut butter mixture. Whisk vigorously until icing is fully combined, using electric beaters if necessary. All your powdered sugar should be combined with no clumps remaining.

Step 9

When cake is done baking, pour icing over cake while still warm. Enjoy!