📖 Instructions

1. Prepare your oven and pan: First things first, preheat your oven to 350°F (175°C). Then, grab a 9x13 inch baking pan. Line it with parchment paper, leaving an overhang on the longer sides. This little trick makes lifting the cooled bars out super easy. Lightly grease the exposed sides of the pan too, just for good measure.
2. Combine dry ingredients: In a medium bowl, whisk together your all-purpose flour, baking powder, and salt. Make sure there are no lumps—you want everything nicely combined. Set this aside for now.
3. Cream butter and sugars: In a large mixing bowl (or the bowl of your stand mixer), beat the softened unsalted butter with the granulated sugar and light brown sugar on medium speed until the mixture is light, fluffy, and looks pale in color. This usually takes about 2-3 minutes. Don't rush this step; creaming properly incorporates air, giving your bars a lovely texture.
4. Add eggs and vanilla: Crack in your two large eggs, one at a time, beating well after each addition until just combined. Scrape down the sides of the bowl to ensure everything is incorporated. Then, mix in the vanilla extract. The mixture might look a bit curdled, but that's okay, it'll smooth out when you add the dry ingredients.
5. Incorporate dry ingredients: Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until *just* combined. Be careful not to overmix; overmixing can lead to tough bars. Stop as soon as you no longer see streaks of flour.
6. Fold in mix-ins: Gently fold in the dried cranberries and white chocolate chips using a spatula. Distribute them evenly throughout the batter.
7. Bake the bars: Spread the batter evenly into your prepared 9x13 inch baking pan. Use the back of a spoon or an offset spatula to smooth the top. Pop it into the preheated oven and bake for 25-30 minutes. You're looking for the edges to be lightly golden and a toothpick inserted into the center to come out with moist crumbs, not wet batter. If it looks too gooey, give it a few more minutes.
8. Cool completely: Once baked, remove the pan from the oven and let the bars cool completely in the pan on a wire rack. This is crucial! Trying to frost warm bars will result in a melty mess. Patience is key here, friends!
9. Make the cream cheese frosting: While the bars are cooling, prepare your frosting. In a clean mixing bowl, beat the softened cream cheese and softened butter together on medium speed until smooth and creamy, about 2 minutes. Add the powdered sugar, vanilla extract, and orange zest (if using). Beat on low speed until combined, then increase to medium-high and beat for another 1-2 minutes until light and fluffy. If it's too thick, add a tiny bit of milk or cream; too thin, add more powdered sugar.
10. Frost and decorate: Once the bars are completely cool, carefully lift them out of the pan using the parchment paper overhang. Spread the cream cheese frosting evenly over the top. If desired, sprinkle with additional dried cranberries or chopped white chocolate for a pretty finish.
11. Chill and cut: Transfer the frosted bars to the refrigerator for at least 30 minutes to allow the frosting to set. This makes for much cleaner cuts. Once chilled, cut into squares or rectangles. Enjoy your blissful creation!