Step 1: Preheat and Prep
Start by preheating your oven to 350°F (175°C). Line an 8x8-inch (20x20cm) baking pan with parchment paper, leaving some overhang on the sides for easy removal later. This step ensures that your squares will come out of the pan cleanly and without sticking.
Step 2: Make the Crust
In a medium bowl, combine the flour and granulated sugar. Cut in the cold, cubed butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs. Press the mixture firmly into the prepared pan to form an even layer. Bake for 15 minutes or until lightly golden. This shortbread crust provides the perfect base for the gooey filling.
Step 3: Prepare the Filling
While the crust bakes, whisk together the melted butter, brown sugar, eggs, maple syrup, vanilla extract, and salt in a separate bowl until smooth. If you’re using raisins or pecans, stir them in now. The filling should be rich, glossy, and slightly thick.
Step 4: Assemble and Bake
Pour the filling over the baked crust, spreading it evenly. Return the pan to the oven and bake for 20-25 minutes, or until the filling is set but still slightly jiggly in the center. Be careful not to overbake, as the squares will firm up as they cool.
Step 5: Cool and Serve
Let the squares cool completely in the pan before lifting them out using the parchment paper overhang. Cut into squares and serve. For an extra touch, drizzle with a little extra maple syrup or sprinkle with powdered sugar.