Delicious Oatmeal Whoopie Pies

Ingredients

• 1 cup rolled oats
• 1 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, softened
• 1/2 cup brown sugar
• 1/4 cup granulated sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 1/2 cup raisins
• 1/2 cup chopped walnuts
• 1/2 cup cream cheese, softened
• 1/4 cup unsalted butter, softened
• 2 cups powdered sugar