1-First Step: Preheat and Prep Preheat your oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving overhang for easy removal. This setup prevents sticking and makes cutting soft chocolate sugar cookie bars simple. Gather all ingredients at room temperature for smooth mixing, especially the 1 cup softened unsalted butter.

2-Second Step: Cream Butter and Sugar In a large bowl, beat 1 cup softened butter and 1 ½ cups granulated sugar with an electric mixer until light and fluffy, about 2-3 minutes. Scrape down sides as needed. This step incorporates air for tender chocolate cookie bars. For extra flavor, add a pinch of cinnamon here.

3-Third Step: Add Eggs and Vanilla Beat in 2 large eggs one at a time, followed by 1 teaspoon vanilla extract. Mix until fully combined and smooth. Room-temp eggs blend better, avoiding lumps in your sugar cookie bars dough. Vegan adaptation: Use flax eggs for the same binding power.

4-Fourth Step: Combine Dry Ingredients In a separate bowl, whisk together 2 ½ cups all-purpose flour (spooned and leveled), 1 teaspoon baking powder, and ½ teaspoon salt. Gradually add dry mix to the wet ingredients on low speed. Stop mixing once just combined to keep bars chewy.

5-Fifth Step: Fold in Chocolate Chips Gently fold in 1 ½ cups chocolate chips with a spatula. For double chocolate cookie bars, stir in ½ cup cocoa powder now, reducing flour by ¼ cup. Distribute chips evenly for chocolate in every bite. Chill dough 30 minutes for crispier edges if desired.

6-Sixth Step: Spread and Bake Transfer dough to the prepared pan and spread evenly with an offset spatula. Bake at 350°F for 25-30 minutes, until edges turn golden and center sets but remains soft. Rotate pan halfway for even baking. Overbaking leads to dry bars, so watch closely.

7-Final Step: Cool and Cut Cool in pan on a wire rack for 30 minutes, then lift out using parchment. Cool completely before cutting into 24 bars. Store as directed below. These stay fresh and soft for days.