Preheat your oven to 350°F (175°C) and line a 9x13-inch baking pan with parchment paper.

In a mixing bowl, cream together butter and brown sugar until light and fluffy, about 2-3 minutes.

Add in eggs, vanilla extract, and orange zest, mixing until well combined.

In a separate bowl, whisk together flour, baking powder, and salt, then gradually add to the wet mixture.

Fold in dried cranberries and white chocolate chips, ensuring even distribution.

Pour the batter into the prepared pan and smooth the surface; bake for 25-30 minutes.

Allow the bars to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Prepare the frosting by beating cream cheese and butter together, then add powdered sugar, vanilla, and orange zest until smooth.

Spread the cream cheese frosting over the cooled bars and garnish with chopped cranberries and white chocolate chips.

Chill the frosted bars in the refrigerator for 30 minutes before slicing and serving.