Preheat your oven to 350°F (175°C). Grease your 9x9-inch baking pan or line it with parchment paper, leaving some overhang for easy removal later.
In a large mixing bowl, whisk together the melted unsalted butter, brown sugar, and granulated sugar until smooth and glossy. Add the eggs one at a time, whisking after each addition. Stir in the vanilla extract until fully incorporated.
In a separate bowl, sift together the all-purpose flour, baking powder, and salt. This ensures an even distribution of the leavening agent and prevents lumps.
Gradually add the dry ingredients to the wet mixture, stirring gently with a spatula. Be careful not to overmix — just combine until no dry flour streaks remain.
Fold in the dried cranberries and white chocolate chips evenly throughout the batter. These add texture and bursts of flavor in every bite.
Spread the batter evenly into your prepared baking pan. Bake for 25-30 minutes or until the edges are golden and a toothpick inserted in the center comes out with just a few moist crumbs.
Allow the blondies to cool completely in the pan on a wire rack. Once cooled, lift them out using the parchment overhang and slice into squares. Serve and enjoy!