Preheat your oven to 350°F (175°C). This ensures your cake bakes evenly and rises beautifully.
Grease a 9-inch round cake pan with a little non-stick spray or butter. This will help your cake release easily after baking.
In a mixing bowl, combine the 1 1/2 cups of chocolate chips. Melt them in the microwave in 30-second intervals, stirring in between until smooth. Alternatively, you can melt the chocolate chips using a double boiler on the stovetop.
In a separate bowl, crack the 4 large eggs and beat them until they are light and frothy. This will help incorporate air into the cake, making it light and fluffy.
Once the chocolate is melted and slightly cooled, gently fold the beaten eggs into the chocolate mixture. Be careful not to deflate the eggs; you want to maintain as much air as possible.
Pour the combined mixture into your prepared cake pan, spreading it evenly with a spatula.
Bake in the preheated oven for approximately 25-30 minutes, or until a toothpick inserted into the center comes out clean. The cake will rise during baking and then settle as it cools.
Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Once cool, slice and serve as desired!