Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan. A light coating of cooking spray or butter will help your brownies release smoothly later.

In a mixing bowl, cream together the softened butter and brown sugar. The goal here is to achieve a smooth, fluffy consistency. Beat in the eggs one by one, mixing thoroughly after each addition. Finally, add the vanilla extract and mix until everything is well incorporated.

In a separate bowl, whisk together the flour, cinnamon, baking powder, and sea salt. This step is essential to evenly distribute the leavening agent and spices throughout the batter.

Gradually add the dry ingredients to the wet mixture. Stir gently until just combined. Over-mixing can lead to dense brownies, so be careful here.

The final step is folding in your chocolate chips and nuts. This adds both texture and flavor. The nuts provide a satisfying crunch, while the chocolate chips melt just enough to add bursts of chocolatey goodness throughout.

Pour the batter into your prepared pan and spread it evenly. Bake in the preheated oven for approximately 25-30 minutes. Keep an eye on them! A toothpick inserted in the center should come out with a few moist crumbs but not wet batter.

Once your blondies have baked, allow them to cool in the pan for about 10 minutes before transferring them to a wire rack. Once fully cooled, you can cut them into squares and enjoy!