Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking pan or line it with parchment paper for easy removal.
Step 2: Prepare the Crust
In a mixing bowl, combine the gluten-free flour, softened butter, powdered sugar, vanilla extract, and salt. Mix until the dough comes together.
Press the dough evenly into the bottom of the prepared baking pan. Bake for 15 minutes or until lightly golden.
Step 3: Make the Pumpkin Filling
In a large mixing bowl, combine the pumpkin puree, granulated sugar, brown sugar, eggs, vanilla extract, cinnamon, nutmeg, ginger, cloves, salt, and evaporated milk. Whisk until smooth and well combined.
Step 4: Combine and Bake
Pour the pumpkin filling over the pre-baked crust, spreading it evenly. Bake for an additional 25–30 minutes or until the filling is set and a toothpick inserted in the center comes out clean.
Step 5: Cool and Serve
Allow the pumpkin squares to cool in the pan on a wire rack. Once cooled, cut into squares and dust with powdered sugar if desired.