For the Cookie
- ¼ cup unsalted butter half a stick, melted
- ¼ cup granulated sugar
- ¼ cup dark brown sugar
- ¼ teaspoon salt
- 1 large egg yolk
- 1 teaspoon vanilla extract
- ½ cup plus 3 tablespoons all purpose flour
- ¼ teaspoon baking soda
- 3 ounces dark chocolate roughly chopped, or ½ cup chocolate chips
- Flaky sea salt for sprinkling optional
To Make a Sundae
- Vanilla ice cream optional
- Salted caramel sauce and/or hot fudge sauce optional
- Whipped cream optional
- Chocolate shavings and/or sprinkles optional
Preheat the oven to 350°F (175°C).
In a medium bowl, whisk together the melted butter, granulated sugar, brown sugar, and salt until well combined.
Add the egg yolk and vanilla extract, then continue whisking until the mixture is light and fluffy, about 2 minutes.
Add the flour and baking soda, and use a rubber spatula to mix until no dry streaks remain.
Fold in the chocolate chips until just combined.
Transfer the batter to a 5- or 6-inch cast iron skillet, cake pan, or baking dish.
Sprinkle the top with a pinch of sea salt.
Bake for 20–25 minutes, or until the edges are golden brown and set.
The center will remain soft and doughy. For a firmer cookie, bake for an additional 5–10 minutes.
Let the cookie cool in the pan for about 15 minutes before serving.
For a sundae, top with a scoop (or two) of vanilla ice cream, then drizzle with salted caramel and/or hot fudge sauce.
Add whipped cream, chocolate shavings, and/or sprinkles as desired. Serve immediately.
- Avoid scooping the flour into your measuring cup, which can pack it too densely resulting in a dry dough. Spoon it into the measuring cup, then level off the top for best results.
- For extra gooeyness, press a few extra chocolate chips or chocolate chunks into the top of the skillet before baking.
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Using a smaller skillet is a great way to get a thicker, doughier center.
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Be careful not to over bake if you want that gooey center.
Calories: 432kcal | Carbohydrates: 54g | Protein: 5g | Fat: 22g | Saturated Fat: 13g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 6g | Trans Fat: 0.5g | Cholesterol: 80mg | Sodium: 226mg | Potassium: 205mg | Fiber: 3g | Sugar: 31g | Vitamin A: 428IU | Calcium: 40mg | Iron: 4mg