Preheat the oven to 350ºF. Line a 9×13″ baking dish with parchment paper. This is important so that the bars are easy to get out of the pan.
In a large bowl, whisk together the gluten-free flour, sugar & salt.
In a separate bowl, whisk together the melted butter, sweetened condensed milk, eggs, vanilla, lemon juice & zest until combined.
Mix the butter mixture into the flour mixture until well combined.
Spread the batter into the prepared baking dish and bake for 25-35 minutes until set and just golden brown. A toothpick inserted in the center should come out mostly clean.
Let the bars cool slightly in the pan before glazing.
Glaze:
In a small bowl, whisk together powdered sugar, fresh-squeezed lemon juice, and packed lemon zest until smooth.
Pour glaze over the lemon brownies, using a pastry brush to spread to the edges. Let sit at least 2 hours before serving. If you'd like the topping to set more so that it doesn't run when cutting them, you can place in fridge or let sit longer.
*In my opinion, a good quality all-purpose flour blend does not contain bean flours and is not primarily rice flour. I tested this with gfJules and also Gluten Free Mama's Almond blend. Cup4Cup, and Pamela's are also good blends. See blog post for links to each of these.
**If the gluten-free flour blend you use already has xanthan gum or guar gum in it, then omit the xanthan gum called for in this recipe.
Calories: 198kcal | Carbohydrates: 32g | Protein: 3g | Fat: 7g | Saturated Fat: 4g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 2g | Trans Fat: 0.2g | Cholesterol: 41mg | Sodium: 119mg | Potassium: 76mg | Fiber: 1g | Sugar: 27g | Vitamin A: 224IU | Vitamin C: 2mg | Calcium: 57mg | Iron: 0.4mg
Nutrition information is automatically calculated, so should only be used as an approximation.