Preheat and prep: Preheat your oven to 350°F (175°C). Grease an 8×8-inch baking pan with cooking spray or line with parchment paper for easy removal.
Make cinnamon sugar: In a small bowl, mix together 3 tablespoons granulated sugar with ½ teaspoon ground cinnamon. Set aside.
Mix wet ingredients: In a large mixing bowl, whisk together melted butter and packed brown sugar until smooth and well combined.
Add eggs and honey: Add the egg, honey, and vanilla extract to the butter mixture. Whisk vigorously until fully incorporated and mixture appears glossy.
Add dry ingredients: Stir in the flour, salt, and remaining ½ teaspoon cinnamon. Mix gently until just combined—do not overmix, as this can make blondies tough.
Spread and top: Pour the batter into the prepared pan, spreading evenly to all corners with a rubber spatula. Sprinkle the cinnamon-sugar mixture evenly over the top.
Bake: Bake for 22–25 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out with just a few moist crumbs (not completely clean).
Cool and cut: Remove from oven and let cool completely in the pan on a wire rack for at least 30 minutes. Cut into 16 squares. For cleanest slices, wipe the knife between cuts.