PB Sheet Cake

Ingredients

• ***For the cake:***
• 3 cups cake flour
• 1 tablespoon baking powder
• 1 teaspoon salt
• 1/2 cup unsalted butter, softened
• 1 1/4 cups light brown sugar, packed
• 2 teaspoons vanilla extract
• 1/2 cup vegetable oil
• 3/4 cup creamy peanut butter
• 4 large eggs
• 1 1/4 cups whole milk
• ***For the frosting:***
• 1 cup unsalted butter
• 1 cup creamy peanut butter
• 1/4 cup unsweetened cocoa powder
• 3 cups powdered sugar
• 1/4 cup heavy cream
• 12 chocolate peanut butter cups, optional, for garnish