📖 Instructions

1. Preheat your oven: Adjust an oven rack to the middle position and preheat the oven to 175°C (350°F). Line a 9x13 inch baking pan with parchment paper, leaving an overhang on two sides to easily lift the bars out later. Lightly grease the parchment paper.
2. Prepare the shortbread crust: In a large mixing bowl, combine the all-purpose flour, granulated sugar, and a pinch of salt. Whisk these dry ingredients together until they are well combined.
3. Cut in the butter: Add the cold, cubed unsalted butter to the dry ingredients. Use a pastry blender or your fingertips to cut the butter into the flour mixture until it resembles coarse crumbs. Don't overmix; you want small pea-sized pieces of butter throughout.
4. Form the crust: Press the crumbly mixture evenly into the bottom of the prepared 9x13 inch baking pan. Use the bottom of a flat glass or measuring cup to compact it firmly. A good, firm crust is key here.
5. Partially bake the crust: Bake the crust for 18-20 minutes, or until it's light golden brown around the edges. While the crust is baking, prepare the topping mixture.
6. Make the cranberry topping: In a separate medium mixing bowl, whisk together the melted unsalted butter, light brown sugar (packed), granulated sugar, and large eggs. Whisk until smooth and well combined, about 1-2 minutes.
7. Add extracts and dry ingredients: Stir in the vanilla extract, almond extract (if using), all-purpose flour, baking powder, and salt. Mix until just combined. Be careful not to overmix the batter.
8. Fold in cranberries and white chocolate chips: Gently fold in the dried cranberries and white chocolate chips with a spatula. You want them distributed throughout the batter.
9. Spread topping over crust: Carefully pour the cranberry and white chocolate mixture evenly over the warm, partially baked shortbread crust. Use an offset spatula to spread it smoothly to the edges.
10. Bake the bars: Return the pan to the oven and bake for another 25-30 minutes, or until the topping is set, lightly golden brown, and a wooden skewer inserted into the center comes out with moist crumbs attached (not wet batter).
11. Cool the bars: Remove the pan from the oven and let the bars cool completely in the pan on a wire rack. This is crucial for clean cuts, so resist the urge to cut them while warm! It might take 1-2 hours.
12. Prepare the white chocolate drizzle (optional but highly recommended): Once the bars are completely cool, melt the white chocolate chips with the heavy cream in a small microwave-safe bowl. Microwave in 30-second intervals, stirring well after each, until smooth and creamy. Be careful not to overheat.
13. Drizzle and swirl: Drizzle the melted white chocolate mixture evenly over the cooled bars. For a beautiful swirled effect, use a toothpick or the tip of a knife to gently swirl the white chocolate into the topping.
14. Set the drizzle: Let the white chocolate drizzle set completely before cutting. You can place the pan in the refrigerator for about 15-20 minutes to speed this up, or simply let it sit at room temperature for another 30 minutes.
15. Cut and serve: Once set, use the parchment paper overhangs to lift the entire slab of bars from the pan. Transfer to a cutting board and cut into 24 squares. Enjoy your delicious cranberry white chocolate swirl bars!