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

In a medium bowl, whisk together melted unsalted butter and light brown sugar until well combined, then add egg, honey, and vanilla extract, whisking until smooth.

In another bowl, stir together all-purpose flour, salt, and ½ teaspoon of ground cinnamon, then fold this into the wet ingredients until just combined.

Pour the blondie batter into the prepared pan and evenly sprinkle the cinnamon-sugar mixture over the top.

Bake in the preheated oven for 22-25 minutes, until golden and a toothpick inserted in the center comes out clean with a few moist crumbs.

Let the blondies cool completely in the pan on a wire rack for about 30 minutes, then slice into squares.