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Preheat the oven to 350° F and spray a 9” springform pan with baking spray.
In a medium sized microwave safe bowl melt the 1/2 cup butter. Add the 2/3 cup brown sugar and 2 tbsp white sugar and mix till smooth.
Add the egg and egg yolk and 1 tsp vanilla extract and mix again.
Add in the 2 cups flour, 1/2 tsp baking powder, 1/4 tsp baking soda, and 1/4 tsp kosher salt and stir until a dough forms.
Stir in the 1 1/2 cup chocolate chips. Mix until evenly combined.
Press the cookie dough evenly into the springform pan. Wet your hands if the dough is sticky.
Bake for 22-25 minutes or until the top is golden brown. If the edges are browning too quick, cover loosely with aluminum foil.
Cool the cake for at least 30 minutes before frosting. You can put it in the fridge to firm up quicker.
Make the chocolate frosting. Fill a piping bag or a zip top bag with frosting and pipe around the cake. Sprinkle immediately with sprinkles.
If the cookie is underbaked, put it in the fridge for an hour to firm up, it'll be just fine!
Serving: 1 slice , Calories: 396 kcal , Carbohydrates: 48 g , Protein: 5 g , Fat: 21 g , Saturated Fat: 12 g , Polyunsaturated Fat: 1 g , Monounsaturated Fat: 6 g , Trans Fat: 0.4 g , Cholesterol: 62 mg , Sodium: 139 mg , Potassium: 207 mg , Fiber: 3 g , Sugar: 27 g , Vitamin A: 347 IU , Vitamin C: 5 mg , Calcium: 46 mg , Iron: 3 mg
Course: Cake, Cakes, cookie, Cookies, Dessert, desserts
Cuisine: American, Anything