1-First Step: Begin by preheating your oven to 350°F (175°C). While the oven heats, prepare a 9×13 inch baking pan by lining it with parchment paper, leaving an overhang on the sides for easy removal later. This prevents sticking and makes cleanup effortless. If you don’t have parchment paper, thoroughly grease the pan with butter and dust it lightly with flour.

2-Second Step: In a large mixing bowl, cream together the 1 cup of softened butter and 1.5 cups of sugar until the mixture is light and fluffy. This should take about 3-5 minutes with an electric mixer on medium speed. For the best texture, start with butter that has been sitting at room temperature for about 30 minutes not melted, but soft enough to easily indent with a finger.

3-Third Step: Add the 2 eggs one at a time to the butter mixture, beating well after each addition. Then stir in the 2 teaspoons of vanilla extract. This gradual incorporation ensures proper emulsion, which leads to a better texture in the final bars.

4-Fourth Step: In a separate medium bowl, whisk together the 3 cups of flour, 1 teaspoon of baking soda, and 1/2 teaspoon of salt. This dry mixture should be well combined to ensure even distribution of the leavening agent throughout the dough.

5-Fifth Step: Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Be careful not to overmix, as this can result in tough bars. The dough should be thick and slightly sticky. If you’re adding chocolate chips, nuts, or other mix-ins, fold them in now using a spatula.

6-Sixth Step: Press the dough evenly into the prepared baking pan. You can use your hands or the back of a greased spatula to create an even layer. For the most uniform bars, try to maintain consistent thickness across the entire pan.

7-Seventh Step: Bake in the preheated oven for 12-14 minutes, or until the edges are lightly golden but the center still appears slightly underbaked. They will continue to cook slightly as they cool, resulting in the perfect chewy texture. Overbaking will make them crisp and dry.

8-Eighth Step: Remove from the oven and allow the bars to cool completely in the pan. This cooling period is crucial as the bars firm up during this time. Cooling typically takes about 1-2 hours at room temperature.

9-Final Step: While the bars are cooling, prepare the frosting by beating together 1/2 cup of softened butter, 2 cups of powdered sugar, 2 teaspoons of vanilla extract, and 2-3 tablespoons of heavy cream until light and fluffy. Once the bars are completely cool, spread the frosting evenly over the top, then cut into squares and serve. For a decorative touch, sprinkle with coarse sugar or chocolate shavings before serving.