1/3 CUP OF OIL TO BUTTER RECIPES

Steps:

• Preheat oven to 350 degrees F (175 degrees C). Grease a baking sheet.
• Whisk flour, white sugar, and baking soda together in a bowl. Beat 1/2 cup milk, eggs, and 1 teaspoon vanilla extract into flour mixture using an electric mixer on low until smooth.
• Cook and stir water, 1/2 cup butter, vegetable oil, and 1/2 cup peanut butter together in a saucepan over medium heat until smooth, about 5 minutes. Stir peanut butter mixture into flour mixture until batter is well mixed; pour onto the prepared baking sheet.
• Bake in the preheated oven until a toothpick inserted in the center of the cake comes out clean, about 20 minutes.
• Melt 1/2 cup butter and 1/2 cup peanut butter together in a saucepan over medium heat until smooth; add 1/3 cup milk and 1 teaspoon vanilla extract. Whisk confectioners' sugar into mixture until icing is smooth, 3 to 5 minutes. Pour icing over warm cake.

Steps:

• Preheat oven to 350°. Grease a 15x10x1-in. baking pan., In a large bowl, whisk flour, sugar, baking soda and salt. In a small saucepan, combine water and butter; bring just to a boil. Stir in peanut butter and oil until blended. Stir into flour mixture. In a small bowl, whisk eggs, buttermilk and vanilla until blended; add to flour mixture, whisking constantly., Transfer to prepared pan. Bake until a toothpick inserted in center comes out clean, 20-25 minutes., Meanwhile, for glaze, combine sugar, milk and butter in a saucepan. Bring to a boil, stirring constantly; cook and stir 2 minutes. Remove from heat; stir in peanut butter, marshmallows and vanilla until blended. Spoon over warm cake, spreading evenly. Cool on a wire rack.