Step 1: Preheat your oven to 350°F (175°C) to ensure even baking.
Step 2: Grease your 9x9 inch baking pan or line it with parchment paper.
Step 3: In a large mixing bowl, combine cookie butter, brown sugar, and granulated sugar. Mix until smooth. Add vanilla, egg, egg yolk, and molasses; whisk until well combined.
Step 4: In another bowl, whisk together flour, cinnamon, and salt. Gradually add to wet ingredients, stirring until just combined.
Step 5: Fold in chopped semi-sweet chocolate until evenly distributed.
Step 6: Pour the batter into the prepared baking pan and spread evenly. Bake for about 25-30 minutes or until edges are golden.
Step 7: Sprinkle chopped chocolate on top immediately after removing from the oven. Cool for 10 minutes before transferring to a cooling rack. Sprinkle with flaky sea salt after cooling.
