Step 1: Prepare the Baking Dish

Line an 8-inch square baking dish with parchment paper, leaving a bit of overhang on the sides to make it easier to lift the brownies out after baking. Lightly spray the parchment paper with cooking spray to prevent sticking.

Step 2: Mix the Batter

In a medium-sized mixing bowl, combine the cake mix, lemon pudding mix, lemon juice, eggs, and lemon zest. Use a hand mixer on low speed to blend the ingredients until fully combined. The batter will be thicker than a traditional cake batter, which is normal.

Step 3: Transfer the Batter to the Pan

Pour the batter into the prepared baking dish, using a spatula to spread it evenly. Since the batter is thick, smoothing it out will help ensure even baking.

Step 4: Bake the Brownies

Preheat the oven to 350°F (175°C) and bake the brownies for 22-24 minutes. To check for doneness, insert a toothpick into the center. If it comes out clean or with a few dry crumbs, the brownies are ready. If it comes out with wet batter, bake for another 2-3 minutes and check again.

Step 5: Cool the Brownies

Remove the brownies from the oven and let them cool in the pan for about 10 minutes. Then, lift the parchment paper to transfer the brownies to a wire rack. Allow them to cool completely before adding the glaze.

Step 6: Make the Glaze

In a small bowl, whisk together the powdered sugar and lemon juice until smooth. The glaze should be thick enough to drizzle but not too runny. If needed, add more lemon juice a few drops at a time to reach the desired consistency.

Step 7: Glaze and Garnish

Drizzle the glaze over the cooled brownies using a spoon or piping bag. For extra lemon flavor, sprinkle additional lemon zest over the top. Let the glaze set for about 5 minutes before slicing.

Step 8: Slice and Serve

Use a sharp knife to cut the brownies into squares. For cleaner slices, wipe the knife with a damp cloth between cuts.