1. Preheat Your Oven
Start by preheating your oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper to prevent sticking and make the blondies easier to remove after baking.

2. Prepare the Blondie Batter
In a medium-sized mixing bowl, combine the melted butter and brown sugar. Stir until the mixture is smooth and the sugar is mostly dissolved. Next, add the beaten egg and vanilla extract, mixing until fully incorporated.

3. Add Dry Ingredients
Gradually add the flour and a pinch of salt to the wet ingredients. Stir gently until the batter is just combined. Be careful not to overmix, as this can make the blondies tough.

4. Spread the Batter
Pour the batter into the prepared baking dish, using a spatula to spread it evenly to the edges.

5. Make the Cinnamon-Sugar Topping
In a small bowl, mix the granulated sugar and cinnamon together until well combined. Sprinkle this mixture evenly over the top of the blondie batter.

6. Bake the Blondies
Place the baking dish in the preheated oven and bake for 22 minutes, or until a toothpick inserted into the center comes out mostly clean (a few moist crumbs are fine).

7. Cool and Cut
Allow the blondies to cool in the baking dish for about 20 minutes before lifting them out using the parchment paper. Transfer them to a cutting board and cut into squares. Enjoy!