This might be the most underrated Crumbl cookie and I finally nailed the copycat. Warm, chewy, loaded with toffee and milk chocolate chips, and finished with a dash of flaky sea salt. You need to try this one.
Cream 1 stick unsalted butter, 4 oz cream cheese, 1 cup light brown sugar, and 0.5 cup granulated sugar in a stand mixer for 3-4 minutes until pale and fluffy—this replicates Crumbl's ultra-tender texture.
Add 1 large egg and 2 tsp pure vanilla extract; mix until thoroughly combined, scraping the bowl as needed.
Whisk together 2.25 cups all-purpose flour, 2 tbsp cornstarch, 1 tsp baking soda, and 0.5 tsp kosher salt in a separate bowl, then slowly mix into the wet ingredients on low speed until just a few streaks of flour remain.
Fold in 1.25 cups milk chocolate chips and 0.75 cup toffee bits by hand—save a handful of each for topping later.
Portion dough into 8 oversized balls (about 4–5 inches across, 135g each), flatten slightly, and chill uncovered on a pan for at least 1 hour; chilling keeps cookies thick and prevents flattening, a Crumbl hallmark.
Preheat oven to 350°F (177°C). Arrange chilled dough balls on a parchment-lined sheet, spaced far apart. Bake for 13–15 minutes until edges are just set and centers look slightly underbaked.
Immediately top hot cookies with reserved toffee bits and milk chocolate chips, then sprinkle each with 1 tsp flaky sea salt. Let cookies cool on tray for at least 10 minutes before serving—this locks in the signature gooey center.