Preheat the oven to 360°F (180°C). Line an 8x8-inch baking pan with parchment paper, leaving an overhang on two sides to lift the blondies out later; set the pan aside.
In a large bowl, whisk together the dry ingredients: 1 cup sifted all-purpose flour, 3/4 cup sugar, 1/4 tablespoon salt, and 1/4 tablespoon baking soda until evenly combined.
In a separate bowl, whisk the wet ingredients until smooth: 1/4 cup dairy-free plain yogurt, 3 tablespoons light extra-virgin olive oil, 2 tablespoons fresh lemon juice, zest of 2 lemons, and 2 eggs.
Pour the dry ingredients into the wet ingredients and stir gently until you have a smooth batter. Do not overmix.
Pour the batter into the prepared pan and spread it evenly with a spatula.
Bake for 15–20 minutes, until the top is golden and a toothpick inserted into the center comes out with a few moist crumbs.
Remove the pan from the oven and let the blondies rest in the pan for 10 minutes.
Use the parchment overhang to lift the blondies from the pan onto a cutting board. Cut into squares or your preferred shapes.
Make the glaze: in a small bowl whisk together 1 cup powdered sugar and the zest of 1 lemon. Gradually whisk in 2 tablespoons fresh lemon juice until you reach a thick glaze consistency.
Brush or drizzle the lemon glaze over the blondie pieces. Allow the glaze to set before serving.