Peanut butter cake:

• 1/4 cup creamy peanut butter
• 1 cup water
• 1/2 cup butter
• 1 cup sugar
• 1 cup brown sugar
• 2 cups flour
• 1 teaspoon salt
• 1 teaspoon baking soda
• 2 eggs
• 1/2 cup buttermilk
• 1 teaspoon vanilla

Frosting:

• 6 TBLS butter
• 1/4 cup milk
• 1/2 cup peanut butter
• 2 1/2 cups sifted powdered sugar
• 2 teaspoons vanilla

1. Line a 9 x 13 pan with parchment paper and lightly grease with butter or spray. Preheat oven to 375 degrees.
2. FOR THE CAKE: Gently melt the peanut butter and butter together in a microwave safe mixing bowl, then carefully blend in the water.
3. In a separate mixing bowl combine the sugar, brown sugar, flour, baking soda, and salt.
4. Pour the peanut butter mixture into the flour bowl, add in the eggs, buttermilk and vanilla, then mix together really well.  Pour the batter into the pan and bake for 25 minutes.
5. FOR THE FROSTING: In a microwave safe mixing bowl, gently heat the butter and peanut butter on low until just soft enough to blend.
6. Once butters are blended, carefully stir in the milk and vanilla and mix in powdered sugar 1 cup at a time.
7. Frost the cake once it has cooled.