Preheat your oven to 350°F (175°C) and prepare an 8x8-inch baking pan by greasing or lining with parchment paper.

In a large mixing bowl, whisk together the melted unsalted butter and packed light brown sugar until combined. Add one large egg, honey, and vanilla extract, mixing until no lumps remain.

Sift in the all-purpose flour, salt, and ground cinnamon. Gently stir until just combined to avoid overmixing.

Pour the blondie batter into the prepared baking pan, spreading evenly into the corners.

In a small bowl, mix granulated sugar with remaining ground cinnamon and sprinkle over the blondie batter.

Bake in the preheated oven for 22-25 minutes, until the edges are golden brown and a toothpick comes out clean.

Once baked, cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.