In a large mixing bowl, combine the melted butter, eggs, and vanilla extract. Whip until fully incorporated.
Next, add the all-purpose flour, salt, light brown sugar, and granulated sugar to the wet mixture. Mix well until a smooth batter forms.
Preheat your oven to 350°F. Grease a 9×13-inch pan and pour the batter into it. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Once done, remove the honey bun brownies from the oven and let them cool for about 10-15 minutes. This helps to set and create a perfect texture. Serve warm or at room temperature.