For the Chocolate Chip Toffee Bars:

• Preheat the oven to 350 (F). Spray your baking tin with cooking spray, line with parchment paper, and then spray again.
• Whisk together 3 1/2 cups flour, 1 1/2 teaspoon baking soda, 2 teaspoons salt, and 1 teaspoon espresso powder in a medium bowl. Set aside.
• In the bowl of a freestanding electric mixer with a paddle attachment, cream together 1/2 cup butter, 4 oz. cream cheese, 1/2 cup granulated sugar, and 1 1/2 cups dark brown sugar until very light and fluffy, about 5-7 minutes on medium-high.
• Scrape down the sides of the bowl, lower to a slow speed, and add 2 eggs one at a time, making sure each egg is fully incorporated before adding the next. Add 2 teaspoons vanilla.
• With the mixer remaining on low speed, slowly add the flour mixture from the first step. Mix until just combined, taking care not to overmix.
• When the flour is just combined into the sugar mixture, use a rubber spatula to stir in 12 oz. chocolate chips.
• Bake for 350 (F) for 35 - 40 minutes, until the center is set and the edges are deep golden. When the bars are ready, rest on a cooling rack and let cool in the pan.