Preheat the oven to 350°F (175°C). Gather and measure all ingredients.

Cream together softened butter and brown sugar until light and fluffy for about 2-3 minutes.

Beat in the egg and vanilla extract until combined.

Gradually add the flour, oats, baking soda, and salt mixture to the wet mixture, combining until just incorporated.

Fold in the dried cranberries and white chocolate chips gently.

Spread the mixture evenly into a lined baking dish, about 1 inch thick.

Bake for 25-30 minutes or until golden and a toothpick comes out clean.

Let the bars cool in the pan for 10-15 minutes and then transfer to a wire rack to cool completely.

Mix softened cream cheese and powdered sugar to create frosting, and spread it on top once bars are completely cooled.

Cut bars into squares or rectangles and serve. Store in an airtight container.