Chocolate chip cookie cake with chocolate frosting

This chocolate chip cookie cake topped with chocolate frosting is a pure chocolate decadence. The cake comes out soft, chewy, moist, and is packed with chocolate chips. The chocolate frosting just takes it over the top!

📝 Ingredients

• 3/4 cup (175g) soft unsalted butter, at room temperature, preferably European-style butter
• 3/4 cup (150g) light brown sugar
• 1/4 cup (50g) granulated sugar
• 2 large eggs (at room temperature)
• 1 tablespoon vanilla extract
• 2 cups (250g) all-purpose flour (spooned and leveled)
• 2 teaspoons corn starch
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (90g) milk chocolate chips
• 3/4 cup (135g) dark chocolate chips, or chopped chocolate
• 2 tablespoons sprinkles (optional)
• 1/2 cup (115g) soft unsalted butter, at room temperature
• 1/3 cup (35g) cocoa powder, I used Dutch-processed but any will work
• 1 1/4 cups (150g) powdered sugar
• 2 teaspoons vanilla extract
• big pinch of salt
• 1 tablespoon heavy cream or milk

👨‍🍳 Instructions

1. 1--- Make the cookie cake: ---
2. 2Preheat the oven to 350°F/180°C/Gas Mark 4, no fan (if you have a convection oven, reduce the temperature by about 20° or follow the manufacturer's instructions).
3. 3Add soft butter and both types of sugar into the mixing bowl. Mix with an electric mixer or with a stand mixer fitted with a paddle-shaped attachment at medium-low speed until well-combined and fluffy, about 1-2 minutes.
4. 4Add eggs and vanilla extract, beat for 1-2 minutes until well-combined.
5. 5Sift flour, baking soda, corn starch, and salt into the mixing bowl. Mix at low speed until half-combined.
6. 6Add chocolate chips or roughly chopped chocolate (or a mix of both) and sprinkles (if using), mix until combined but don't overmix the dough.
7. 7Line the bottom of a 10-inch (25-26 cm) heart-shaped cake pan with parchment paper. Transfer the dough into the pan and even it out with a spatula.
8. 8Bake for 30-35 minutes. After 15-20 minutes cover it loosely with a piece of aluminum foil. The cake should be light golden in color, right after taking it out of the oven it can be a little bit jiggly in the middle, but after 1-2 minutes (outside of the oven) it should not be jiggly anymore. The edges of the cake should be completely set and firm to the touch but the center should be soft. A toothpick inserted into the center of the cake should come out with just a few crumbs, it should not come out clean. The center of the cake will collapse while cooling - this is normal. The baking time may vary depending on the oven and cake pan used.
9. 9Important: You need to wait for the cake to cool down completely before decorating it with the frosting or before cutting it into servings (it needs to set). This will take about an hour.
10. 10--- Make the chocolate frosting: ---
11. 11In a medium bowl, using an electric mixer, beat soft butter for a minute until fluffy.
12. 12Sift powdered sugar, cocoa powder, and salt into the bowl. Mix until well-combined.
13. 13Add vanilla extract and heavy cream and mix until well-combined. Don't mix the frosting for too long or there will be air bubbles in it. You can add a little bit more cream to your frosting if you want it thinner.
14. 14Transfer the frosting to a pastry bag fitted with a large star tip. Swirl frosting onto cooled cake.
15. 15Sprinkle the cake with more sprinkles (optional).
16. 16Enjoy!