Preparation Steps

• Preheat the oven for 400°F and coat a small baking dish in butter or nonstick cooking spray. Set aside.
• Combine the butter and 1 cup of chocolate chips in a large microwave safe bowl. Heat the ingredients in the microwave for 30 seconds, give the mixture a stir, and then heat for an additional 30 seconds, until smooth.
• Add your eggs and egg yolks to the bowl along with the vanilla extract. Whisk vigorously until the eggs are fully combined with the melted chocolate mixture.
• Gently fold in the flour and granulated sugar until just combined, and you don't see any leftover flour streaks. Then gently fold in the remaining 0.5 cup chocolate chips.
• Pour the batter into the prepared baking dish. Bake for 14 to 16 minutes, just until the edges are set and the middle of the cake is still slightly jiggly.