Preheat the oven to 325°F (170°C). Grease a round cake pan and line with parchment paper.
2. Step
Add the chocolate chips to a microwave-safe bowl and melt completely, about 1 minute.
3. Step
Separate the egg yolks from the whites. With an electric hand mixer, whisk the whites until soft peaks form.
4. Step
Add the egg yolks, one at a time, the bowl of melted chocolate and stir to combine.
5. Step
Using a rubber spatula, gently fold ⅓ of the whipped egg whites at a time into the chocolate mixture.
6. Step
Pour the batter into the prepared cake pan and smooth the top. Bake the cake for 30 minutes.
7. Step
Once the cake is cool to the touch, gently invert it onto a serving plate. Slice and dust with powdered sugar and/or serve with ice cream and fruit, if desired.
