Peanut Butter Banana Oatmeal Cream Pies

Ingredients (19)

• 3/4 cup unsalted butter
• 1 cup packed brown sugar
• 1/2 cup sugar
• 1 egg
• 1 teaspoon vanilla extract
• 1 cup mashed bananas
• 1 1/2 cups flour
• 1 1/2 teaspoons cinnamon
• 1 teaspoon baking soda
• 2 teaspoon cornstarch
• 1/2 teaspoon salt
• 3 cups old fashioned oats
• 1 cup marshmallow creme
• 1 cup creamy peanut butter
• 1/2 cup shortening
• 1/4 cup powdered sugar
• 1 teaspoon vanilla
• Pinch salt
• 1-3 Tablespoons hot water