Gooey Chocolate Peanut Butter Bar - Love of Food

Ingredients

• 8 ounces (2 sticks) unsalted butter, softened
• 1 1⁄2 cups packed brown sugar
• 1 cup sugar
• 2 1⁄2 cups creamy peanut butter, divided use
• 1 large egg
• 1 1⁄2 teaspoons vanilla extract
• 2 1⁄2 cups quick oats
• 2 cups flour
• 1⁄2 teaspoon salt
• 1 teaspoon baking soda
• 6 tablespoons unsalted butter, softened
• 1 teaspoon vanilla extract
• 1⁄2 cup milk
• 4 cups powdered sugar
• ½ cup cocoa powder